DOSAGE & ADMINISTRATION SECTION.

2 DOSAGE AND ADMINISTRATION. Doses should be individualized based on safety and efficacy. Starting doses per indication are noted below.Myelofibrosis (2.2)The starting dose of JAKAFI/JAKAFI XR is based on patients baseline platelet count: Greater than 200 109/L: JAKAFI 20 mg given orally twice daily or JAKAFI XR 44 mg given orally once daily. 100 109/L to 200 109/L: JAKAFI 15 mg given orally twice daily or JAKAFI XR 33 mg given orally once daily. 50 109/L to less than 100 109/L: JAKAFI mg given orally twice daily or JAKAFI XR 11 mg given orally once daily.Polycythemia Vera (2.3)The starting dose of JAKAFI is 10 mg given orally twice daily or JAKAFI XR 22 mg given orally once daily.Acute Graft-Versus-Host Disease (2.4)The starting dose of JAKAFI is mg given orally twice daily or JAKAFI XR 11 mg given orally once daily.Chronic Graft-Versus-Host Disease (2.5)The starting dose of JAKAFI is 10 mg given orally twice daily or JAKAFI XR 22 mg given orally once daily.. The starting dose of JAKAFI/JAKAFI XR is based on patients baseline platelet count: Greater than 200 109/L: JAKAFI 20 mg given orally twice daily or JAKAFI XR 44 mg given orally once daily. 100 109/L to 200 109/L: JAKAFI 15 mg given orally twice daily or JAKAFI XR 33 mg given orally once daily. 50 109/L to less than 100 109/L: JAKAFI mg given orally twice daily or JAKAFI XR 11 mg given orally once daily.. The starting dose of JAKAFI is 10 mg given orally twice daily or JAKAFI XR 22 mg given orally once daily.. The starting dose of JAKAFI is mg given orally twice daily or JAKAFI XR 11 mg given orally once daily.. The starting dose of JAKAFI is 10 mg given orally twice daily or JAKAFI XR 22 mg given orally once daily.. 2.1 Monitoring to Assess Safety. Prior to JAKAFI/JAKAFI XR treatment:Perform complete blood count (CBC) [see Warnings and Precautions (5.1)].Inquire about past infections, including tuberculosis, herpes simplex, herpes zoster, and hepatitis [see Warnings and Precautions (5.2)].During treatment with JAKAFI/JAKAFI XR:Perform CBC every to weeks until doses are stabilized, and then as clinically indicated [see Warnings and Precautions (5.1)].Assess lipid parameters approximately to 12 weeks following initiation of JAKAFI/JAKAFI XR therapy [see Warnings and Precautions (5.5)] .. Perform complete blood count (CBC) [see Warnings and Precautions (5.1)].. Inquire about past infections, including tuberculosis, herpes simplex, herpes zoster, and hepatitis [see Warnings and Precautions (5.2)].. Perform CBC every to weeks until doses are stabilized, and then as clinically indicated [see Warnings and Precautions (5.1)].. Assess lipid parameters approximately to 12 weeks following initiation of JAKAFI/JAKAFI XR therapy [see Warnings and Precautions (5.5)] .. 2.2 Recommended Dosage for Myelofibrosis. The recommended starting dose of JAKAFI/JAKAFI XR is based on platelet count (Table 1). Doses may be titrated based on safety and efficacy.Table 1: JAKAFI/JAKAFI XR Starting Doses for Myelofibrosis Platelet Count JAKAFI Starting Dose JAKAFI XR Starting Dose Greater than 200 109/L 20 mg orally twice daily44 mg orally once daily 100 109/L to 200 109/L 15 mg orally twice daily33 mg orally once daily 50 109/L to less than 100 109/L mg orally twice daily 11 mg orally once daily DoseModification Guidelines for Hematologic Toxicity for Patients With Myelofibrosis StartingTreatment With Platelet Count of 100 109/L or Greater. Dose ReductionsJAKAFI dose reductions should be considered if the platelet counts decrease as outlined in Table with the goal of avoiding dose interruptions for thrombocytopenia.Table 2: Myelofibrosis: JAKAFI Dosing Recommendations for Thrombocytopenia for Patients Starting Treatment With Platelet Count of 100 109/L or GreaterDose at Time of Platelet DeclinePlatelet Count25 mg Twice Daily20 mg Twice Daily15 mg Twice Daily10 mg Twice Daily5 mg Twice DailyNew DoseNew DoseNew DoseNew DoseNew Dose100 to less than 125 109/L20 mg twice daily15 mg twice dailyNo ChangeNo ChangeNo Change75 to less than 100 109/L10 mg twice daily10 mg twice daily10 mg twice dailyNo ChangeNo Change50 to less than 75 109/L5 mg twice daily5 mg twice daily5 mg twice daily5 mg twice dailyNo ChangeLess than 50 109/LHoldHoldHoldHoldHoldJAKAFI XR dose reductions should be considered if the platelet counts decrease as outlined in Table 3, with the goal of avoiding dose interruptions for thrombocytopenia.Table 3: Myelofibrosis: JAKAFI XR Dosing Recommendations for Thrombocytopenia for Patients Starting Treatment With Platelet Count of 100 109/L or GreaterDose at Time of Platelet DeclinePlatelet Count55 mg Once Daily44 mg Once Daily33 mg Once Daily22 mg Once Daily11 mg Once DailyNew DoseNew DoseNew DoseNew DoseNew Dose100 to less than 125 109/L44 mg once daily33 mg once dailyNo changeNo changeNo change75 to less than 100 109/L22 mg once daily22 mg once daily22 mg once dailyNo changeNo change50 to less than 75 109/L11 mg once daily11 mg once daily11 mg once daily11 mg once dailyNo changeLess than 50 109/LHoldHoldHoldHoldHoldTreatment Interruption and Restarting DosingInterrupt treatment for platelet counts less than 50 109/L or absolute neutrophil count (ANC) less than 0.5 109/L.After recovery of platelet counts above 50 109/L and ANC above 0.75 109/L, dosing may be restarted. When restarting JAKAFI, begin with dose that is at least mg twice daily below the dose at interruption. When restarting JAKAFI XR, begin with dose that is at least 11 mg once daily below the dose at interruption. The maximum allowable dose that may be used in restarting JAKAFI/JAKAFI XR after previous interruption is outlined in Table for thrombocytopenia and in Table for neutropenia.Table 4: Myelofibrosis: Maximum Restarting Doses for JAKAFI/JAKAFI XR After Safety Interruption for Thrombocytopenia for Patients Starting Treatment With Platelet Count of 100 109/L or Greater Current Platelet Count Maximum Dose When Restarting JAKAFI Treatment Maximum Dose When Restarting JAKAFI XR Treatment Greater than or equal to 125 109/L20 mg twice daily44 mg once daily 100 to less than 125 109/L15 mg twice daily33 mg once daily 75 to less than 100 109/L10 mg twice daily for at least weeks; if stable, may increase to 15 mg twice daily22 mg once daily for at least weeks; if stable, may increase to 33 mg once daily 50 to less than 75 109/L5 mg twice daily for at least weeks; if stable, may increase to 10 mg twice daily11 mg once daily for at least weeks; if stable, may increase to 22 mg once daily Less than 50 109/LContinue holdTable 5: Myelofibrosis: Maximum Restarting Doses for JAKAFI/JAKAFI XR After Safety Interruption for Neutropenia (ANC 0.5 109/L)Current Neutrophil CountMaximum Dose When Restarting JAKAFI Treatment Maximum Dose When Restarting JAKAFI XR Treatment ANC >= 0.75 109/LFor patients on mg twice daily prior to interruption, restart at mg once daily ORFor patients with dose greater than mg twice daily prior to interruption, restart at mg twice daily below the largest dose in the week prior to interruptionFor patients on 11 mg once daily prior to the first interruption, restart at 11 mg once daily. Discontinue for second interruption ORFor patients with dose greater than 11 mg once daily prior to interruption, restart at 11 mg once daily below the largest dose in the week prior to interruption. Dose Modification Based on Insufficient Response forPatients With Myelofibrosis Starting Treatment With Platelet Count of100 109/L or Greater. If the response is insufficient and platelet and neutrophil counts are adequate, JAKAFI doses may be increased in mg twice daily increments to maximum of 25 mg twice daily. JAKAFI XR doses may be increased in 11 mg once daily increments to maximum of 55 mg once daily. Doses should not be increased during the first weeks of therapy and not more frequently than every weeks.Consider dose increases in patients who meet all of the following conditions:Failure to achieve reduction from pretreatment baseline in either palpable spleen length of 50% or 35% reduction in spleen volume as measured by computed tomography (CT) or magnetic resonance imaging (MRI);Platelet count greater than 125 109/L at weeks and platelet count never below 100 109/L;ANC Levels greater than 0.75 109/L.Based on limited clinical data, long-term maintenance at JAKAFI mg twice daily dose has not shown responses and continued use at this dose should be limited to patients in whom the benefits outweigh the potential risks. Discontinue JAKAFI/JAKAFI XR if there is no spleen size reduction or symptom improvement after months of therapy. Failure to achieve reduction from pretreatment baseline in either palpable spleen length of 50% or 35% reduction in spleen volume as measured by computed tomography (CT) or magnetic resonance imaging (MRI);. Platelet count greater than 125 109/L at weeks and platelet count never below 100 109/L;. ANC Levels greater than 0.75 109/L.. Dose Modifications for Hematologic Toxicityfor Patients With Myelofibrosis Starting Treatment With Platelet Counts of50 109/L to Less Than 100 109/L. This section applies only to patients with platelet counts of 50 109/L to less than 100 109/L prior to any treatment with JAKAFI/JAKAFI XR. See dose modifications in Section 2.2 Dose Modification Guidelines for Hematologic Toxicity for Patients With Myelofibrosis Starting Treatment With Platelet Count of 100 109/L or Greater for hematological toxicity in patients whose platelet counts were 100 109/L or more prior to starting treatment with JAKAFI/JAKAFI XR.Dose ReductionsReduce the dose of JAKAFI/JAKAFI XR for platelet counts less than 35 109/L as described in Table 6.Table 6: Myelofibrosis: Dosing Modifications for Thrombocytopenia for Patients With Starting Platelet Count of 50 109/L to Less Than 100 109/LPlatelet CountJAKAFI Dosing Recommendations JAKAFI XR Dosing Recommendations 25 109/L to less than 35 109/L AND the platelet count decline is 20% or greater during the prior weeks For patients with dose greater than mg twice daily, reduce the dose by mg twice daily.For patients on mg twice daily, reduce the dose to mg once daily.For patients on mg once daily, maintain dose at mg once daily.Reduce dose by 11 mg once daily.For patients on 11 mg once daily, interrupt dosing.25 109/L to less than 35 109/L AND the platelet count decline is less than 20% during the prior weeks Less than 25 109/LInterrupt dosing. Treatment Interruption and Restarting DosingInterrupt treatment for platelet counts less than 25 109/L or ANC less than 0.5 109/L.After recovery of platelet counts above 35 109/L and ANC above 0.75 109/L, dosing may be restarted. For patients on dose higher than mg twice daily, when restarting JAKAFI, begin with dose that is at least mg twice daily below the largest dose in the week prior to interruption. For patients on JAKAFI mg twice daily in the week prior to interruption, when restarting, reduce the dose to mg once daily. When restarting JAKAFI XR, begin with dose that is at least 11 mg once daily below the largest dose in the week prior to the treatment interruption. For patients on JAKAFI XR 11 mg once daily prior to the first interruption, continue JAKAFI XR 11 mg once daily. Discontinue JAKAFI XR for second interruption. For patients with dose greater than mg twice daily, reduce the dose by mg twice daily.. For patients on mg twice daily, reduce the dose to mg once daily.. For patients on mg once daily, maintain dose at mg once daily.. Reduce dose by 11 mg once daily.. For patients on 11 mg once daily, interrupt dosing.. Dose Modifications Based on Insufficient Response for Patients With Myelofibrosis and Starting Platelet Count of 50 109/L to Less Than 100 109/L. Do not increase doses during the first weeks of therapy, and do not increase the dose more frequently than every weeks.If the response is insufficient as defined in Section 2.2 (see Dose Modification Based on Insufficient Response for Patients With Myelofibrosis Starting Treatment With Platelet Count of 100 109/L or Greater), doses may be increased from JAKAFI mg once daily to JAKAFI mg twice daily, or from JAKAFI mg twice daily to maximum of 10 mg twice daily, if the following conditions are met. For patients on JAKAFI XR 11 mg once daily, dose may be increased to maximum of 22 mg once daily if:the platelet count has remained at least 40 109/L, andthe platelet count has not fallen by more than 20% in the prior weeks, andthe ANC is more than x 109/L, andthe dose has not been reduced or interrupted for an adverse event or hematological toxicity in the prior weeks.Continuation of treatment for more than months should be limited to patients in whom the benefits outweigh the potential risks. Discontinue JAKAFI/JAKAFI XR if there is no spleen size reduction or symptom improvement after months of therapy.. the platelet count has remained at least 40 109/L, and. the platelet count has not fallen by more than 20% in the prior weeks, and. the ANC is more than x 109/L, and. the dose has not been reduced or interrupted for an adverse event or hematological toxicity in the prior weeks.. Dose Modification for Bleeding. Interrupt treatment for bleeding requiring intervention regardless of current platelet count. Once the bleeding event has resolved, consider resuming treatment at the prior dose if the underlying cause of bleeding has been controlled. If the bleeding event has resolved but the underlying cause persists, consider resuming treatment with JAKAFI/JAKAFI XR at lower dose. 2.3 Recommended Dosage for Polycythemia Vera. The recommended starting dose of JAKAFI is 10 mg orally twice daily.The recommended starting dose of JAKAFI XR is 22 mg orally once daily.Doses may be titrated based on safety and efficacy.. Dose Modification Guidelines for Patients With Polycythemia Vera. Dose ReductionsDose reductions should be considered for hemoglobin and platelet count decreases as described in Table 7.Table 7: Polycythemia Vera: Dose ReductionsHemoglobin and/or Platelet CountJAKAFI Dosing Recommendations JAKAFI XR Dosing Recommendations Hemoglobin 10 to less than 12 g/dL AND platelet count 75 to less than 100 109/LDose reductions should be considered with the goal of avoiding dose interruptions for anemia and thrombocytopenia. Hemoglobin to less than 10 g/dL OR platelet count 50 to less than 75 109/LReduce dose by mg twice daily.For patients on mg twice daily, reduce the dose to mg once daily.Reduce dose by 11 mg once daily.For patients on 11 mg once daily, interrupt dosing. Hemoglobin less than g/dL OR platelet count less than 50 109/LInterrupt dosing.Treatment Interruption and Restarting DosingInterrupt treatment for hemoglobin less than g/dL, platelet counts less than 50 109/L or ANC less than x 109/L. After recovery of the hematologic parameter(s) to acceptable levels, dosing may be restarted.Table illustrates the dose that may be used in restarting JAKAFI/JAKAFI XR after previous interruption.Table 8: Polycythemia Vera: Restarting Doses for JAKAFI/JAKAFI XR After Safety Interruption for Hematologic Parameter(s)Use the most severe category of patients hemoglobin, platelet count, or ANC abnormality to determine the corresponding maximum restarting dose.Hemoglobin, Platelet Count, or ANCJAKAFI Maximum Restarting DoseJAKAFI XR Maximum Restarting Dose Hemoglobin less than g/dL OR platelet count less than 50 109/L OR ANC less than x 109/L Continue holdHemoglobin to less than 10 g/dL OR platelet count 50 to less than 75 109/L OR ANC to less than 1.5 109/L mg twice dailyContinue JAKAFI treatment for at least weeks; if stable, may increase dose by mg twice daily.or no more than mg twice daily less than the dose which resulted in dose interruption11 mg once dailyContinue JAKAFI XR treatment for at least weeks; if stable, may increase dose by 11 mg once daily.or no more than 11 mg once daily less than the dose which resulted in dose interruptionHemoglobin 10 to less than 12 g/dL OR platelet count 75 to less than 100 109/L OR ANC 1.5 to less than x 109/L 10 mg twice dailyor no more than mg twice daily less than the dose which resulted in dose interruption22 mg once dailyor no more than 11 mg once daily less than the dose which resulted in dose interruptionHemoglobin greater than or equal to 12 g/dL OR platelet count greater than or equal to 100 109/L OR ANC greater than or equal to x 109/L 15 mg twice dailyor no more than mg twice daily less than the dose which resulted in dose interruption 33 mg once daily or no more than 11 mg once daily less than the dose which resulted in dose interruptionJAKAFIPatients who had required dose interruption while receiving dose of mg twice daily, may restart JAKAFI at dose of mg twice daily or mg once daily, but not higher, once hemoglobin is greater than or equal to 10 g/dL, platelet count is greater than or equal to 75 109/L, and ANC is greater than or equal to 1.5 109/L.JAKAFI XR Patients who had required dose interruption while receiving dose of 11 mg once daily, may restart JAKAFI XR at dose of 11 mg once daily, but not higher, once hemoglobin is greater than or equal to 10 g/dL, platelet count is greater than or equal to 75 109/L, and ANC is greater than or equal to 1.5 109/L.Dose Management After Restarting TreatmentAfter restarting JAKAFI/JAKAFI XR following treatment interruption, doses may be titrated, but the maximum total daily dose should not exceed mg twice daily (JAKAFI) or 11 mg once daily (JAKAFI XR) less than the dose that resulted in the dose interruption. An exception to this is dose interruption following phlebotomy-associated anemia, in which case the maximal total daily dose allowed after restarting JAKAFI/JAKAFI XR would not be limited.. Reduce dose by mg twice daily.. For patients on mg twice daily, reduce the dose to mg once daily.. Reduce dose by 11 mg once daily.. For patients on 11 mg once daily, interrupt dosing. Dose Modifications Based on Insufficient Response for Patients With Polycythemia Vera. If the response is insufficient and platelet, hemoglobin, and neutrophil counts are adequate, doses may be increased:JAKAFI: in mg twice daily increments to maximum of 25 mg twice daily. JAKAFI XR: in 11 mg once daily increments to maximum of 55 mg once daily. Doses should not be increased during the first weeks of therapy and not more frequently than every weeks.Consider dose increases in patients who meet all of the following conditions: Inadequate efficacy as demonstrated by or more of the following:Continued need for phlebotomyWBC greater than the upper limit of normal rangePlatelet count greater than the upper limit of normal rangePalpable spleen that is reduced by less than 25% from baseline Platelet count greater than or equal to 140 109/LHemoglobin greater than or equal to 12 g/dLANC greater than or equal to 1.5 109/L. Inadequate efficacy as demonstrated by or more of the following:Continued need for phlebotomyWBC greater than the upper limit of normal rangePlatelet count greater than the upper limit of normal rangePalpable spleen that is reduced by less than 25% from baseline Continued need for phlebotomy. WBC greater than the upper limit of normal range. Platelet count greater than the upper limit of normal range. Palpable spleen that is reduced by less than 25% from baseline. Platelet count greater than or equal to 140 109/L. Hemoglobin greater than or equal to 12 g/dL. ANC greater than or equal to 1.5 109/L. 2.4 Recommended Dosage for Acute Graft-Versus-Host Disease JAKAFIThe recommended starting dose of JAKAFI is mg given orally twice daily. Consider increasing the dose to 10 mg twice daily after at least days of treatment if the ANC and platelet counts are not decreased by 50% or more relative to the first day of dosing with JAKAFI.JAKAFI XRThe recommended starting dose of JAKAFI XR is 11 mg given orally once daily. Consider increasing the dose to 22 mg once daily after at least days of treatment if the ANC and platelet counts are not decreased by 50% or more relative to the first day of dosing with JAKAFI XR.Treatment CompletionConsider tapering JAKAFI/JAKAFI XR after months of treatment in patients with response who have discontinued therapeutic doses of corticosteroids. Taper JAKAFI/JAKAFI XR by one dose level approximately every weeks using the dose levels shown in Table 9. If aGVHD signs or symptoms recur during or after the taper of JAKAFI/JAKAFI XR, consider retreatment.Table 9: Reduced Dose Levels for Patients With aGVHD or cGVHDDose Level Recommended JAKAFI DoseRecommended JAKAFI XR Dose Maximum dose10 mg twice daily22 mg once daily Reduced dose level -15 mg twice daily11 mg once dailyReduced dose level -25 mg once dailyDo not use JAKAFI XRDose Modification Guidelines for Patients With Acute Graft-Versus-Host DiseaseMonitor CBC, including platelet count and ANC, and bilirubin prior to initiating therapy, every to weeks until doses are stabilized, and then as indicated clinically.Modify the dose of JAKAFI/JAKAFI XR for adverse reactions as described in Table 10. See Table for the recommended dose when dose reduction is needed. Patients who are unable to tolerate JAKAFI at dose of mg once daily should have treatment interrupted until their clinical and/or laboratory parameters recover.Table 10: Dose Modifications for Adverse Reactions in Patients With Acute GVHDLaboratory ParameterDosing RecommendationsClinically significant thrombocytopenia after supportive measuresReduce dose by dose level. When platelets recover to previous values, dosing may return to prior dose level. ANC less than x 109/L considered related to JAKAFI/JAKAFI XRHold JAKAFI/JAKAFI XR up to 14 days; resume at dose level lower upon recoverySee Table for reduced dose levels.. Total bilirubin elevation, no liver GVHD3-5 ULN: Continue JAKAFI/JAKAFI XR at dose level lower until recovery. 5-10 ULN: Hold JAKAFI/JAKAFI XR for up to 14 days until bilirubin <= 1.5 ULN; resume at current dose upon recovery. Total bilirubin 10 ULN: Hold JAKAFI/JAKAFI XR for up to 14 days until bilirubin <= 1.5 ULN; resume at dose level lower upon recovery.Total bilirubin elevation, liver GVHD> x ULN: Continue JAKAFI/JAKAFI XR at dose level lower until recovery.. 2.5 Recommended Dosage for Chronic Graft-Versus-Host Disease. JAKAFIThe recommended starting dose of JAKAFI is 10 mg given orally twice daily.JAKAFI XRThe recommended starting dose of JAKAFI XR is 22 mg given orally once daily.Treatment CompletionConsider tapering JAKAFI/JAKAFI XR after months of treatment in patients with response who have discontinued therapeutic doses of corticosteroids. Taper JAKAFI/JAKAFI XR by dose level approximately every weeks using the dose levels shown in Table 9. If GVHD signs or symptoms recur during or after the taper of JAKAFI/JAKAFI XR, consider retreatment.Dose Modification Guidelines for Patients With Chronic Graft-Versus-Host DiseaseMonitor CBC, including platelet count and ANC, and bilirubin prior to initiating therapy, every to weeks until doses are stabilized, and then as indicated clinically. Modify the dose of JAKAFI/JAKAFI XR for adverse reactions as described in Table 11. See Table for the recommended dose when dose reduction is needed. Patients who are unable to tolerate JAKAFI at dose of mg once daily should have treatment interrupted until their clinical and/or laboratory parameters recover.Table 11: Dose Modifications for Adverse Reactions in Patients With Chronic GVHDParameterDosing Recommendations Platelet count less than 20 109/L Reduce JAKAFI/JAKAFI XR by dose levelSee Table for reduced dose levels.. If resolved within days, dosing may return to initial dose level. If not resolved within days, then maintain at dose level lower.ANC less than 0.75 109/L considered related to JAKAFI/JAKAFI XRReduce JAKAFI/JAKAFI XR by dose level; resume at initial dose level upon recovery.ANC less than 0.5 109/L considered related to JAKAFI/JAKAFI XRHold JAKAFI/JAKAFI XR for up to 14 days; resume at dose level lower upon recovery. May resume initial dose level when ANC greater than x 109/L.Total bilirubin: 3-5 ULNContinue JAKAFI/JAKAFI XR at dose level lower until recovery. If resolved within 14 days, then increase by dose level. If not resolved within 14 days, then maintain the reduced dose level.Total bilirubin: 5-10 ULNHold JAKAFI/JAKAFI XR for up to 14 days until resolved; resume at current dose upon recovery. If not resolved within 14 days, then resume at dose level lower upon recovery.Total bilirubin: 10 ULNHold JAKAFI/JAKAFI XR for up to 14 days until resolved; resume at dose level lower upon recovery. If not resolved within 14 days, discontinue.Other Adverse Reactions: Grade 3Continue JAKAFI/JAKAFI XR at dose level lower until recovery. Other Adverse Reactions: Grade Discontinue JAKAFI/JAKAFI XR.. 2.6 Dose Modifications for Concomitant Use With Strong CYP3A4 Inhibitors or Fluconazole. Modify the JAKAFI/JAKAFI XR dosage when coadministered with strong CYP3A4 inhibitors or doses of less than or equal to 200 mg of fluconazole [see Drug Interactions 7 ], according to Table 12. Avoid concomitant use of JAKAFI/JAKAFI XR with fluconazole doses of greater than 200 mg daily.Table 12:Dose Modifications for Concomitant Use With Strong CYP3A4 Inhibitors or FluconazoleFor patients coadministered strong CYP3A4 inhibitors or doses of less than or equal to 200 mg of fluconazoleRecommended JAKAFI Dose ModificationRecommended JAKAFI XR Dose Modification Starting dose for patients with MF with platelet count:Greater than or equal to 100 109/L10 mg twice daily22 mg once daily 50 109/L to less than 100 109/LJAKAFI mg once daily Do not use JAKAFI XR Starting dose for patients with PV:5 mg twice daily11 mg once daily If on stable dose for patients with MF or PV:JAKAFI: Greater than or equal to 10 mg twice dailyJAKAFI XR: Greater than or equal to 22 mg once dailyReduce dose by 50% (round up to the closest available tablet strength) JAKAFI: mg twice dailyJAKAFI mg once daily Do not use JAKAFI XR JAKAFI: mg once dailyJAKAFI XR: 11 mg once dailyAvoid strong CYP3A4 inhibitor or fluconazole treatment or interrupt JAKAFI/JAKAFI XR treatment for the duration of strong CYP3A4 inhibitor or fluconazole useStarting dose for patients with aGVHD:Fluconazole doses of less than or equal to 200 mgJAKAFI mg once daily Do not use JAKAFI XROther CYP3A4 inhibitors Monitor blood counts more frequently for toxicity and modify the JAKAFI/JAKAFI XR dosage for adverse reactions if they occur [see Dosage and Administration (2.4, 2.5)]. Starting dose for patients with cGVHD:Fluconazole doses of less than or equal to 200 mg JAKAFI mg twice daily JAKAFI XR 11 mg once daily Other CYP3A4 inhibitorsMonitor blood counts more frequently for toxicity and modify the JAKAFI/JAKAFI XR dosage for adverse reactions if they occur [see Dosage and Administration (2.4, 2.5)].. Greater than or equal to 100 109/L. 50 109/L to less than 100 109/L. JAKAFI: Greater than or equal to 10 mg twice daily. JAKAFI XR: Greater than or equal to 22 mg once daily. JAKAFI: mg twice daily. JAKAFI: mg once daily. JAKAFI XR: 11 mg once daily. 2.7 Dose Modifications for Renal or Hepatic Impairment. Moderate to Severe Renal Impairment or End Stage Renal Disease on DialysisModify the JAKAFI/JAKAFI XR dosage for patients with moderate (CLcr 30 to 59 mL/min) to severe (CLcr 15 to 29 mL/min) renal impairment or end stage renal disease (ESRD) on dialysis according to Table 13. Avoid use of JAKAFI/JAKAFI XR in patients with ESRD (CLcr less than 15 mL/min) not requiring dialysis [see Use in Specific Populations 8.6 )].Table 13: Dose Modifications for Renal ImpairmentCLcr creatinine clearance; ESRD end stage renal diseaseRenal Impairment StatusPlatelet CountJAKAFI Recommended Starting Dosage JAKAFI XR Recommended Starting Dosage Patients with MFModerate or SevereGreater than 150 109/LNo dose adjustment100 to 150 109/LJAKAFI 10 mg twice dailyJAKAFI XR 22 mg once daily50 to less than 100 109/L JAKAFI mg once daily Do not use JAKAFI XRLess than 50 109/L Avoid use [see Use in Specific Populations (8.6)] ESRD on dialysis100 to 200 109/L JAKAFI 15 mg once after dialysis sessionDo not use JAKAFI XR Greater than 200 109/L JAKAFI 20 mg once after dialysis sessionDo not use JAKAFI XRPatients with PVModerate or SevereAnyJAKAFI mg twice dailyJAKAFI XR 11 mg once dailyESRD on dialysis AnyJAKAFI 10 mg once after dialysis sessionDo not use JAKAFI XRPatients with aGVHDModerate or Severe AnyJAKAFI mg once dailyDo not use JAKAFI XRESRD on dialysis AnyJAKAFI mg once after dialysis sessionDo not use JAKAFI XRPatients with cGVHD Moderate or SevereAnyJAKAFI mg twice dailyJAKAFI XR 11 mg once dailyESRD on dialysis AnyJAKAFI 10 mg once after dialysis sessionDo not use JAKAFI XR Hepatic ImpairmentModify the JAKAFI/JAKAFI XR dosage for patients with hepatic impairment according to Table 14.Table 14: Dose Modifications for Hepatic ImpairmentHepatic Impairment StatusPlatelet CountJAKAFI Recommended Starting DosageJAKAFI XR Recommended Starting Dosage Patients with MFMild, Moderate, or Severe (Child-Pugh Class A, B, C) Greater than 150 109/LNo dose adjustment100 109/L to 150 109/L10 mg twice daily 22 mg once daily50 to less than 100 109/LJAKAFI mg once dailyDo not use JAKAFI XRLess than 50 109/LAvoid use [see Use in Specific Populations (8.7)] Patients with PVMild, Moderate, or Severe (Child-Pugh Class A, B, C)Any5 mg twice daily11 mg once daily Patients with aGVHDMild, Moderate, or Severe based on NCI criteria without liver GVHD AnyNo dose adjustmentStage 1, or Liver aGVHDAnyNo dose adjustmentStage Liver aGVHDAny JAKAFI mg once dailyDo not use JAKAFI XRPatients with cGVHDMild, Moderate, or Severe based on NCI criteria without liver GVHDAnyNo dose adjustment Score or Liver cGVHDAnyNo dose adjustment Score Liver cGVHDAnyMonitor blood counts more frequently for toxicity and modify the JAKAFI/JAKAFI XR dosage for adverse reactions if they occur [see Dosage and Administration (2.4, 2.5)].. 2.8 Method of Administration. JAKAFIJAKAFI is dosed orally and can be administered with or without food.If dose is missed, the patient should not take an additional dose, but should take the next usual prescribed dose.When discontinuing JAKAFI therapy for reasons other than potentially life-threatening toxicities, gradually taper the dose of JAKAFI, for example by mg twice daily each week.For patients unable to ingest tablets, JAKAFI can be administered through nasogastric tube (8 French or greater) as follows:Suspend tablet in approximately 40 mL of water with stirring for approximately 10 minutes.Within hours after the tablet has dispersed, the suspension can be administered through nasogastric tube using an appropriate syringe.The tube should be rinsed with approximately 75 mL of water. The effect of tube feeding preparations on JAKAFI exposure during administration through nasogastric tube has not been evaluated.JAKAFI XRJAKAFI XR is dosed orally and can be administered with or without food.Swallow JAKAFI XR tablets whole. Do not split, chew, or crush.If dose is missed, the patient should not take an additional dose, but should take the next usual prescribed dose.When discontinuing JAKAFI XR therapy for reasons other than potentially life-threatening toxicities, gradually taper the dose of JAKAFI XR, for example by 11 mg once daily each week for JAKAFI XR.. Suspend tablet in approximately 40 mL of water with stirring for approximately 10 minutes.. Within hours after the tablet has dispersed, the suspension can be administered through nasogastric tube using an appropriate syringe.

ADVERSE REACTIONS SECTION.

6 ADVERSE REACTIONS. The following clinically significant adverse reactions are discussed in greater detail in other sections of the labeling:Thrombocytopenia, Anemia and Neutropenia [see Warnings and Precautions (5.1)] Risk of Infection [see Warnings and Precautions (5.2)] Symptom Exacerbation Following Interruption or Discontinuation of Treatment [see Warnings and Precautions (5.3)] Non-Melanoma Skin Cancer [see Warnings and Precautions (5.4)] Lipid Elevations see Warnings and Precautions 5.5 )] Major Adverse Cardiovascular Events (MACE) see Warnings and Precautions 5.6 )] Thrombosis see Warnings and Precautions 5.7 )] Secondary Malignancies see Warnings and Precautions 5.8 )] Thrombocytopenia, Anemia and Neutropenia [see Warnings and Precautions (5.1)] Risk of Infection [see Warnings and Precautions (5.2)] Symptom Exacerbation Following Interruption or Discontinuation of Treatment [see Warnings and Precautions (5.3)] Non-Melanoma Skin Cancer [see Warnings and Precautions (5.4)] Lipid Elevations see Warnings and Precautions 5.5 )] Major Adverse Cardiovascular Events (MACE) see Warnings and Precautions 5.6 )] Thrombosis see Warnings and Precautions 5.7 )] Secondary Malignancies see Warnings and Precautions 5.8 )] In myelofibrosis and polycythemia vera, the most common hematologic adverse reactions (incidence 20%) are thrombocytopenia and anemia. The most common nonhematologic adverse reactions (incidence >= 15%) are bruising, dizziness, headache, and diarrhea. (6.1)In acute graft-versus-host disease, the most common hematologic adverse reactions (incidence 50%) are anemia, thrombocytopenia, and neutropenia. The most common nonhematologic adverse reactions (incidence 50%) are infections (pathogen not specified) and edema. (6.1)In chronic graft-versus-host disease, the most common hematologic adverse reactions (incidence 35%) are anemia and thrombocytopenia. The most common nonhematologic adverse reactions (incidence >= 20%) are infections (pathogen not specified) and viral infections. (6.1)To report SUSPECTED ADVERSE REACTIONS, contact Incyte Corporation at 1-855-463-3463 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. In myelofibrosis and polycythemia vera, the most common hematologic adverse reactions (incidence 20%) are thrombocytopenia and anemia. The most common nonhematologic adverse reactions (incidence >= 15%) are bruising, dizziness, headache, and diarrhea. (6.1). In acute graft-versus-host disease, the most common hematologic adverse reactions (incidence 50%) are anemia, thrombocytopenia, and neutropenia. The most common nonhematologic adverse reactions (incidence 50%) are infections (pathogen not specified) and edema. (6.1). In chronic graft-versus-host disease, the most common hematologic adverse reactions (incidence 35%) are anemia and thrombocytopenia. The most common nonhematologic adverse reactions (incidence >= 20%) are infections (pathogen not specified) and viral infections. (6.1). 6.1Clinical Trials Experience. Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.The safety of JAKAFI XR has been established from adequate and well-controlled studies of JAKAFI in adult patients with myelofibrosis, polycythemia vera, and adult and pediatric patients with acute and chronic graft-versus-host-disease [see Clinical Studies (14)]. Below is display of the adverse reactions of JAKAFI in these adequate and well-controlled studies.MyelofibrosisThe safety of JAKAFI was assessed in 617 patients in clinical studies with median duration of follow-up of 10.9 months, including 301 patients with MF in Phase studies.In these Phase studies, patients had median duration of exposure to JAKAFI of 9.5 months (range: 0.5 to 17 months), with 89% of patients treated for more than months and 25% treated for more than 12 months. One hundred and eleven (111) patients started treatment at 15 mg twice daily and 190 patients started at 20 mg twice daily. In patients starting treatment with 15 mg twice daily (pretreatment platelet counts of 100 to 200 109/L) and 20 mg twice daily (pretreatment platelet counts greater than 200 109/L), 65% and 25% of patients, respectively, required dose reduction below the starting dose within the first weeks of therapy.In double-blind, randomized, placebo-controlled study of JAKAFI, among the 155 patients treated with JAKAFI, the most frequent adverse reactions were thrombocytopenia and anemia [see Table 14]. Thrombocytopenia, anemia, and neutropenia are dose-related effects. The most frequent nonhematologic adverse reactions were bruising, dizziness, and headache [see Table 13 ]. Discontinuation for adverse events, regardless of causality, was observed in 11% of patients treated with JAKAFI and 11% of patients treated with placebo.Table 15 presents the most common nonhematologic adverse reactions occurring in patients who received JAKAFI in the double-blind, placebo-controlled study during randomized treatment.Table 15: Myelofibrosis: Nonhematologic Adverse Reactions Occurring in Patients on JAKAFI in the Double-Blind, Placebo-Controlled Study During Randomized Treatment JAKAFI (N 155)Placebo (N 151) Adverse Reactions All GradesNational Cancer Institute Common Terminology Criteria for Adverse Events (CTCAE), version 3.0. (%)Grade (%)Grade (%)All Grades (%)Grade (%)Grade (%) Bruisingincludes contusion, ecchymosis, hematoma, injection site hematoma, periorbital hematoma, vessel puncture site hematoma, increased tendency to bruise, petechiae, purpura. 23< 101500 Dizzinessincludes dizziness, postural dizziness, vertigo, balance disorder, Menieres Disease, labyrinthitis. 18< 10700 Headache1500500 Urinary Tract Infectionsincludes urinary tract infection, cystitis, urosepsis, urinary tract infection bacterial, kidney infection, pyuria, bacteria urine, bacteria urine identified, nitrite urine present. 9005< 1< Weight Gainincludes weight increased, abnormal weight gain. 7< 101< 10 Flatulence500< 100 Herpes Zosterincludes herpes zoster and post-herpetic neuralgia. 200< 100Description of Selected Adverse ReactionsAnemiaIn the Phase clinical studies, median time to onset of first CTCAE Grade or higher anemia was approximately weeks. One patient (< 1%) discontinued treatment because of anemia. In patients receiving JAKAFI, mean decreases in hemoglobin reached nadir of approximately 1.5 to g/dL below baseline after to 12 weeks of therapy and then gradually recovered to reach new steady state that was approximately g/dL below baseline. This pattern was observed in patients regardless of whether they had received transfusions during therapy. In the randomized, placebo-controlled study, 60% of patients treated with JAKAFI and 38% of patients receiving placebo received red blood cell transfusions during randomized treatment. Among transfused patients, the median number of units transfused per month was 1.2 in patients treated with JAKAFI and 1.7 in placebo treated patients.ThrombocytopeniaIn the Phase clinical studies, in patients who developed Grade or thrombocytopenia, the median time to onset was approximately weeks. Thrombocytopenia was generally reversible with dose reduction or dose interruption. The median time to recovery of platelet counts above 50 109/L was 14 days. Platelet transfusions were administered to 5% of patients receiving JAKAFI and to 4% of patients receiving control regimens. Discontinuation of treatment because of thrombocytopenia occurred in 1% of patients receiving JAKAFI and 1% of patients receiving control regimens. Patients with platelet count of 100 109/L to 200 109/L before starting JAKAFI had higher frequency of Grade or thrombocytopenia compared to patients with platelet count greater than 200 109/L (17% versus 7%). NeutropeniaIn the Phase clinical studies, 1% of patients reduced or stopped JAKAFI because of neutropenia.Table 16 provides the frequency and severity of clinical hematology abnormalities reported for patients receiving treatment with JAKAFI or placebo in the placebo-controlled study.Table 16: Myelofibrosis: Worst Hematology Laboratory Abnormalities in the Placebo-Controlled StudyPresented values are worst Grade values regardless of baseline. JAKAFI (N 155) Placebo (N 151) Laboratory Parameter All GradesNational Cancer Institute Common Terminology Criteria for Adverse Events, version 3.0. (%) Grade (%) Grade (%) All Grades (%) Grade (%) Grade (%) Thrombocytopenia 70 4 31 0 Anemia 96 34 11 87 16 Neutropenia 19 2 < 1Additional Data From the Placebo-Controlled Study25% of patients treated with JAKAFI and 7% of patients treated with placebo developed newly occurring or worsening Grade abnormalities in alanine transaminase (ALT). The incidence of greater than or equal to Grade elevations was 2% for JAKAFI with 1% Grade and no Grade ALT elevations.17% of patients treated with JAKAFI and 6% of patients treated with placebo developed newly occurring or worsening Grade abnormalities in aspartate transaminase (AST). The incidence of Grade AST elevations was 1% for JAKAFI with no Grade or AST elevations.17% of patients treated with JAKAFI and 1% of patients treated with placebo developed newly occurring or worsening Grade elevations in cholesterol. The incidence of Grade cholesterol elevations was 1% for JAKAFI with no Grade or cholesterol elevations.Polycythemia VeraIn randomized, open-label, active-controlled study, 110 patients with PV resistant to or intolerant of hydroxyurea received JAKAFI and 111 patients received best available therapy (BAT) [see Clinical Studies 14.2 )]. The most frequent adverse reaction was anemia. Discontinuation for adverse events, regardless of causality, was observed in 4% of patients treated with JAKAFI. Table 17 presents the most frequent nonhematologic adverse reactions occurring up to Week 32.Table 17: Polycythemia Vera: Nonhematologic Adverse Reactions Occurring in >= 5% of Patients on JAKAFI in the Open-Label, Active-Controlled Study up to Week 32 of Randomized TreatmentJAKAFI (N 110)Best Available Therapy (N 111)Adverse Reactions All GradesNational Cancer Institute Common Terminology Criteria for Adverse Events, version 3.0. (%)Grade 3-4 (%)All Grades (%)Grade 3-4 (%)Diarrhea1507< 1Dizzinessincludes dizziness and vertigo. 150130Dyspneaincludes dyspnea and dyspnea exertional. 13340Muscle Spasms12< 150Constipation8030Herpes Zosterincludes herpes zoster and post-herpetic neuralgia. 6< 100Nausea6040Weight Gainincludes weight increased and abnormal weight gain. 60< 10Urinary Tract Infectionsincludes urinary tract infection and cystitis. 603 0Hypertension5< 13< 1Clinically relevant laboratory abnormalities are shown in Table 18.Table 18: Polycythemia Vera: Selected Laboratory Abnormalities in the Open-Label, Active-Controlled Study up to Week 32 of Randomized TreatmentPresented values are worst Grade values regardless of baseline. JAKAFI (N 110)Best Available Therapy (N 111)Laboratory ParameterAll GradesNational Cancer Institute Common Terminology Criteria for Adverse Events, version 3.0. (%)Grade (%)Grade (%)All Grades (%)Grade (%)Grade (%)HematologyAnemia72< 1< 15800Thrombocytopenia275< 1243< 1Neutropenia30< 110< 10ChemistryHypercholesterolemia3500800Elevated ALT25< 101600Elevated AST230023< 10Hypertriglyceridemia15001300Acute Graft-Versus-Host DiseaseIn single-arm, open-label study, 71 adults (ages 18-73 years) were treated with JAKAFI for aGVHD failing treatment with steroids with or without other immunosuppressive drugs [see Clinical Studies 14.3 )]. The median duration of treatment with JAKAFI was 46 days (range: to 382 days).There were no fatal adverse reactions to JAKAFI. An adverse reaction resulting in treatment discontinuation occurred in 31% of patients. The most common adverse reaction leading to treatment discontinuation was infection (10%). Table 19 shows the adverse reactions other than laboratory abnormalities.Table 19: Acute Graft-Versus-Host Disease: Nonhematologic Adverse Reactions Occurring in >= 15% of Patients in the Open-Label, Single Cohort StudyJAKAFI (N 71)Adverse ReactionsSelected laboratory abnormalities are listed in Table 20 below. All GradesNational Cancer Institute Common Terminology Criteria for Adverse Events (CTCAE), version 4.03. (%)Grade 3-4 (%)Infections (pathogen not specified)5541Edema5113Hemorrhage4920Fatigue3714Bacterial infections3228Dyspnea327Viral infections3114Thrombosis2511Diarrhea247Rash233Headache214Hypertension2013Dizziness160Selected laboratory abnormalities during treatment with JAKAFI are shown in Table 20.Table 20: Acute Graft-Versus-Host Disease: Selected Laboratory Abnormalities Worsening from Baseline in the Open-Label, Single Cohort StudyJAKAFI (N 71)Worst grade during treatmentLaboratory ParameterAll GradesNational Cancer Institute Common Terminology Criteria for Adverse Events, version 4.03. (%) Grade 3-4 (%) HematologyAnemia7545Thrombocytopenia7561Neutropenia5840ChemistryElevated ALT488Elevated AST486Hypertriglyceridemia111Chronic Graft-Versus-Host DiseaseIn Phase 3, randomized, open-label, multi-center study, 165 patients were treated with JAKAFI and 158 patients were treated with BAT for cGVHD failing treatment with steroids with or without other immunosuppressive drugs see Clinical Studies 14.4 )]; sixty-five patients crossed over from BAT to treatment with JAKAFI, for total of 230 patients treated with JAKAFI. The median duration of exposure to JAKAFI for the study was 49.7 weeks (range: 0.7 to 144.9 weeks) in the JAKAFI arm. One hundred and nine (47%) patients were on JAKAFI for at least year. There were fatal adverse reactions to JAKAFI, including from toxic epidermal necrolysis and from neutropenia, anemia and/or thrombocytopenia. An adverse reaction resulting in treatment discontinuation occurred in 18% of patients treated with JAKAFI. An adverse reaction resulting in dose modification occurred in 27%, and an adverse reaction resulting in treatment interruption occurred in 23%. The most common hematologic adverse reactions (incidence 35%) are anemia and thrombocytopenia. The most common nonhematologic adverse reactions (incidence >= 20%) are infections (pathogen not specified) and viral infection. Table 21 presents the most frequent nonlaboratory adverse reactions occurring up to Cycle Day of randomized treatment.Table 21:Chronic Graft-Versus-Host Disease: All-Grade (>= 10%) and Grades 3-5 (>= 3%) Nonlaboratory Adverse Reactions Occurring in Patients in the Open-Label, Active-Controlled Study up to Cycle Day of Randomized TreatmentAdverse ReactionGrouped terms that are composites of applicable adverse reaction terms. JAKAFI (N 165)Best Available Therapy (N 158) All Grades (%) Grade >= (%) All Grades (%) Grade >= (%)Infections and infestations Infections (pathogen not specified) 45154416 Viral infections 285235Musculoskeletal and connective tissue disorders Musculoskeletal pain 181130General disorders and administration site conditions Pyrexia 16291 Fatigue 131102 Edema101121Vascular disorders Hypertension 165137 Hemorrhage 122152Respiratory, thoracic and mediastinal disorders Cough 13080 Dyspnea 11181Gastrointestinal disorders Nausea 120132 Diarrhea 101131Clinically relevant laboratory abnormalities are shown in Table 22.Table 22:Chronic Graft-Versus-Host Disease: Selected Laboratory Abnormalities in the Open-Label, Active-Controlled Study up to Cycle Day of Randomized TreatmentPresented values are worst Grade values regardless of baseline. Laboratory TestJAKAFI (N 165)Best Available Therapy (N 158) All GradesNational Cancer Institute Common Terminology Criteria for Adverse Events, version 4.03. (%) Grade >= (%)All Grades (%)Grade >= (%)HematologyAnemia8213758Neutropenia 2712239Thrombocytopenia58205417ChemistryHypercholesterolemia 8810858Elevated AST 655546Elevated ALT 73117116Gamma glutamyltransferase increased 81427538Creatinine increased 471402Elevated lipase 3812309Elevated amylase 358254. 25% of patients treated with JAKAFI and 7% of patients treated with placebo developed newly occurring or worsening Grade abnormalities in alanine transaminase (ALT). The incidence of greater than or equal to Grade elevations was 2% for JAKAFI with 1% Grade and no Grade ALT elevations.. 17% of patients treated with JAKAFI and 6% of patients treated with placebo developed newly occurring or worsening Grade abnormalities in aspartate transaminase (AST). The incidence of Grade AST elevations was 1% for JAKAFI with no Grade or AST elevations.. 17% of patients treated with JAKAFI and 1% of patients treated with placebo developed newly occurring or worsening Grade elevations in cholesterol. The incidence of Grade cholesterol elevations was 1% for JAKAFI with no Grade or cholesterol elevations.. 6.2Postmarketing Experience. The following adverse reactions have been identified during post-approval use of JAKAFI. Because these reactions are reported voluntarily from population of uncertain size, it is not always possible to reliably estimate their frequency or establish causal relationship to drug exposure: Infections and Infestations: herpes simplex virus reactivation and/or disseminationMetabolism and Nutrition disorders: hypoglycemia. Infections and Infestations: herpes simplex virus reactivation and/or dissemination. Metabolism and Nutrition disorders: hypoglycemia.

CLINICAL PHARMACOLOGY SECTION.

12 CLINICAL PHARMACOLOGY. 12.1 Mechanism of Action. Ruxolitinib, kinase inhibitor, inhibits Janus Associated Kinases (JAKs), JAK1 and JAK2, which mediate the signaling of number of cytokines and growth factors that are important for hematopoiesis and immune function. JAK signaling involves recruitment of STATs (signal transducers and activators of transcription) to cytokine receptors, activation, and subsequent localization of STATs to the nucleus leading to modulation of gene expression.MF and PV are myeloproliferative neoplasms (MPNs) known to be associated with dysregulated JAK1 and JAK2 signaling. In mouse model of JAK2V617F-positive MPN, oral administration of ruxolitinib prevented splenomegaly, preferentially decreased JAK2V617F mutant cells in the spleen and decreased circulating inflammatory cytokines (eg, TNF-, IL-6). JAK-STAT signaling pathways play role in regulating the development, proliferation, and activation of several immune cell types important for GVHD pathogenesis. In mouse model of aGVHD, oral administration of ruxolitinib was associated with decreased expression of inflammatory cytokines in colon homogenates and reduced immune-cell infiltration in the colon.. 12.2 Pharmacodynamics. JAKAFI inhibits cytokine-induced STAT3 phosphorylation in whole blood from patients with MF and PV. STAT3 phosphorylation reached maximal inhibition hours after JAKAFI dosing and returned to near baseline by 10 hours in patients with MF and PV. Cardiac ElectrophysiologyAt dose of 1.25 to 10 times the highest recommended starting dosage, JAKAFI does not prolong the QT interval to any clinically relevant extent.. 12.3 Pharmacokinetics. JAKAFIMean ruxolitinib maximal plasma concentration (Cmax) and AUC increased proportionally over single dose range of mg to 200 mg (4 times the approved highest recommended total daily dosage of 25 mg twice daily). Mean ruxolitinib Cmax ranged from 205 nM to 7100 nM and AUC ranged from 862 nMhr to 30,700 nMhr over single dose range of mg to 200 mg. Steady state is reached by Day following repeat twice daily administration of JAKAFI.JAKAFI XRRuxolitinib Cmax and AUC increased in dose proportional manner following single dose administration from the lowest to the highest strength of JAKAFI XR. Steady state is reached by Day following repeat once daily administration of JAKAFI XR.AbsorptionJAKAFIRuxolitinib achieves Cmax within hour to hours post-dose. Oral absorption of ruxolitinib is estimated to be at least 95%.JAKAFI XRRuxolitinib extended-release achieves Cmax within approximately hours post-dose.Effect of FoodJAKAFI and JAKAFI XRNo clinically relevant changes in the pharmacokinetics of ruxolitinib were observed upon administration of JAKAFI with high-fat, high-calorie meal (approximately 800 to 1000 calories of which 50% were derived from fat).DistributionThe mean ruxolitinib volume of distribution at steady-state is 72 (coefficient of variation [CV] 29%) in patients with MF and 75 (23%) in patients with PV. Protein binding of ruxolitinib is approximately 97%, mostly to albumin. EliminationJAKAFIThe mean elimination half-life of ruxolitinib is approximately hours and the mean elimination half-life of ruxolitinib and its metabolites is approximately 5.8 hours in healthy volunteers. Ruxolitinib clearance (%CV) was 17.7 L/h in women and 22.1 L/h in men with MF (39%).Ruxolitinib clearance (%CV) was 12.7 L/h (42%) in patients with PV.Ruxolitinib clearance (%CV) was 11.8 L/h (63%) in patients with aGVHD.Ruxolitinib clearance (%CV) was 9.7 L/h (51%) in patients with cGVHD.JAKAFI XRThe mean elimination half-life of ruxolitinib extended-release is approximately hours in healthy volunteers.MetabolismRuxolitinib is metabolized by CYP3A4 and to lesser extent by CYP2C9.Excretion Following single oral dose of radiolabeled ruxolitinib, 74% of radioactivity was excreted in urine and 22% via feces. Unchanged drug accounted for less than 1% of the excreted total radioactivity. Specific PopulationsNo clinically relevant differences in ruxolitinib pharmacokinetics were observed based on age (12-73 years), race (White, Asian), sex, or weight (29-139 kg). Patients With Renal ImpairmentTotal AUC of ruxolitinib and its active metabolites increased by 1.3-, 1.5-, 1.9-, and 1.6-fold in subjects with mild, moderate, severe renal impairment, and with ESRD after dialysis, respectively, compared to subjects with normal renal function (CLcr >= 90 mL/min). The change in the pharmacodynamic marker, pSTAT3 inhibition, was consistent with the corresponding increase in metabolite exposure with renal impairment. Ruxolitinib is not removed by dialysis; however, the removal of some active metabolites by dialysis cannot be ruled out.Patients With Hepatic ImpairmentNo clinically relevant effect on ruxolitinib pharmacokinetics was observed based on mild to severe hepatic impairment by NCI criteria (total bilirubin ULN and any AST) in patients with aGVHD or cGVHD.Ruxolitinib AUC increased in subjects with mild (Child-Pugh A) by 1.9-fold, moderate (Child-Pugh B) by 1.3-fold, and severe (Child-Pugh C) hepatic impairment by 1.7-fold compared to that in subjects with normal hepatic function.The change in the pharmacodynamic marker, pSTAT3 inhibition, was consistent with the corresponding increase in ruxolitinib exposure except in the severe hepatic impairment cohort where the pharmacodynamic activity was more prolonged in some subjects than expected based on plasma concentrations of ruxolitinib.Patients With Liver Involvement in Graft-Versus-Host DiseaseNo clinically relevant effect on ruxolitinib pharmacokinetics was observed based on Stage 1, or liver aGVHD, or Score or liver cGVHD. lower apparent clearance of ruxolitinib was observed in patients with Stage liver aGVHD compared to patients with no liver aGVHD. The effect of Score liver cGVHD on the pharmacokinetics of ruxolitinib is unknown.Drug Interaction StudiesClinical Studies and Model-Informed Approaches Fluconazole: Fluconazole 100 to 400 mg once daily (a moderate CYP3A4 and CYP2C9 inhibitor) increases steady state ruxolitinib AUC by approximately 100% to 300% see Dosage and Administration (2.6 and Drug Interactions 7 )]. Strong CYP3A4 Inhibitors: Ketoconazole (strong CYP3A4 inhibitor) increased ruxolitinib Cmax by 33% and AUC by 91% and prolonged ruxolitinib half-life from 3.7 hours to hours see Dosage and Administration (2.6 and Drug Interactions 7 )]. Moderate CYP3A4 Inhibitors: Erythromycin (moderate CYP3A4 inhibitor) increased ruxolitinib Cmax by 8% and AUC by 27% [see Drug Interactions (7)].Strong CYP3A4 Inducers: Rifampin (strong CYP3A4 inducer) decreased ruxolitinib Cmax by 32% and AUC by 61%. The relative exposure to ruxolitinibs active metabolites increased approximately 100% see Drug Interactions 7 )]. In Vitro StudiesCytochrome P450 (CYP) Enzymes: Ruxolitinib and its M18 metabolite did not inhibit CYP1A2, CYP2B6, CYP2C8, CYP2C9, CYP2C19, CYP2D6, or CYP3A4. Ruxolitinib did not induce CYP1A2, CYP2B6 or CYP3A4 at clinically relevant concentrations.Transporter Systems: Ruxolitinib and its M18 metabolite did not inhibit the P-gp, BCRP, OATP1B1, OATP1B3, OCT1, OCT2, OAT1, or OAT3 at clinically relevant concentrations. Ruxolitinib was not P-gp substrate.

CLINICAL STUDIES SECTION.

14 CLINICAL STUDIES. 14.1 Myelofibrosis. The effectiveness of JAKAFI XR has been established for myelofibrosis based on adequate and well-controlled studies of JAKAFI in adult patients with myelofibrosis. Below is display of the efficacy results of the adequate and well-controlled studies of JAKAFI in adult patients with myelofibrosis.Two randomized Phase studies (Studies and 2) were conducted in patients with MF (either primary MF, post-polycythemia vera MF or post-essential thrombocythemia MF). In both studies, patients had palpable splenomegaly at least cm below the costal margin and risk category of intermediate (2 prognostic factors) or high risk (3 or more prognostic factors) based on the International Working Group Consensus Criteria (IWG).The starting dose of JAKAFI was based on platelet count. Patients with platelet count between 100 and 200 109/L were started on JAKAFI 15 mg twice daily and patients with platelet count greater than 200 109/L were started on JAKAFI 20 mg twice daily. Doses were then individualized based upon tolerability and efficacy with maximum doses of 20 mg twice daily for patients with platelet counts between 100 to less than or equal to 125 109/L, of 10 mg twice daily for patients with platelet counts between 75 to less than or equal to 100 109/L, and of mg twice daily for patients with platelet counts between 50 to less than or equal to 75 109/L.Study Study (NCT00952289) was double-blind, randomized, placebo-controlled study in 309 patients who were refractory to or were not candidates for available therapy. The median age was 68 years (range: 40 to 91 years) with 61% of patients older than 65 years, and 54% were male. Fifty percent (50%) of patients had primary MF, 31% had post-polycythemia vera MF, and 18% had post-essential thrombocythemia MF. Twenty-one percent (21%) of patients had red blood cell transfusions within weeks of enrollment in the study. The median hemoglobin count was 10.5 g/dL and the median platelet count was 251 109/L. Patients had median palpable spleen length of 16 cm below the costal margin, with 81% having spleen length 10 cm or greater below the costal margin. Patients had median spleen volume as measured by magnetic resonance imaging (MRI) or computed tomography (CT) of 2595 cm3 (range: 478 cm3 to 8881 cm3; the upper limit of normal is approximately 300 cm3).Patients were dosed with JAKAFI or matching placebo. The primary efficacy endpoint was the proportion of patients achieving greater than or equal to 35% reduction from baseline in spleen volume at Week 24 as measured by MRI or CT.Secondary endpoints included duration of 35% or greater reduction in spleen volume and proportion of patients with 50% or greater reduction in Total Symptom Score from baseline to Week 24 as measured by the modified Myelofibrosis Symptom Assessment Form (MFSAF) v2.0 diary.Study 2Study (NCT00934544) was an open-label, randomized study in 219 patients. Patients were randomized 2:1 to JAKAFI versus BAT. Best available therapy was selected by the investigator on patient-by-patient basis. In the BAT arm, the medications received by more than 10% of patients were hydroxyurea (47%) and glucocorticoids (16%). The median age was 66 years (range: 35 to 85 years) with 52% of patients older than 65 years and 57% were male. Fifty-three percent (53%) of patients had primary MF, 31% had post-polycythemia vera MF and 16% had post-essential thrombocythemia MF. Twenty-one percent (21%) of patients had red blood cell transfusions within weeks of enrollment in the study. The median hemoglobin count was 10.4 g/dL and the median platelet count was 236 109/L. Patients had median palpable spleen length of 15 cm below the costal margin, with 70% having spleen length 10 cm or greater below the costal margin. Patients had median spleen volume as measured by MRI or CT of 2381 cm3 (range: 451 cm3 to 7765 cm3).The primary efficacy endpoint was the proportion of patients achieving 35% or greater reduction from baseline in spleen volume at Week 48 as measured by MRI or CT.A secondary endpoint in Study was the proportion of patients achieving 35% or greater reduction of spleen volume as measured by MRI or CT from baseline to Week 24.Study and Efficacy ResultsEfficacy analyses of the primary endpoint in Studies and are presented in Table 23 below. significantly larger proportion of patients in the JAKAFI group achieved 35% or greater reduction in spleen volume from baseline in both studies compared to placebo in Study and BAT in Study 2. similar proportion of patients in the JAKAFI group achieved 50% or greater reduction in palpable spleen length.Table 23: Percent of Patients With Myelofibrosis Achieving 35% or Greater Reduction From Baseline in Spleen Volume at Week 24 in Study and at Week 48 in Study (Intent to Treat) Study Study JAKAFI (N 155) Placebo (N 154) JAKAFI (N 146) Best Available Therapy (N 73) Time points Week 24 Week 48Number (%) of Patients with Spleen Volume Reduction by 35% or More 65 (42) (< 1) 41 (29) P-value 0.0001 0.0001Figure shows the percent change from baseline in spleen volume for each patient at Week 24 (JAKAFI = 139, placebo = 106) or the last evaluation prior to Week 24 for patients who did not complete 24 weeks of randomized treatment (JAKAFI = 16, placebo = 47). One (1) patient (placebo) with missing baseline spleen volume is not included.In Study 1, MF symptoms were secondary endpoint and were measured using the modified MFSAF v2.0 diary. The modified MFSAF is daily diary capturing the core symptoms of MF (abdominal discomfort, pain under left ribs, night sweats, itching, bone/muscle pain, and early satiety). Symptom scores ranged from to 10 with representing symptoms absent and 10 representing worst imaginable symptoms. These scores were added to create the daily total score, which has maximum of 60.Table 24 presents assessments of Total Symptom Score from baseline to Week 24 in Study including the proportion of patients with at least 50% reduction (ie, improvement in symptoms). At baseline, the mean Total Symptom Score was 18.0 in the JAKAFI group and 16.5 in the placebo group. higher proportion of patients in the JAKAFI group had 50% or greater reduction in Total Symptom Score than in the placebo group, with median time to response of less than weeks.Table 24: Improvement in Total Symptom Score in Patients with Myelofibrosis JAKAFI (N 148) Placebo (N 152) Number (%) of Patients with 50% or Greater Reduction in Total Symptom Score by Week 24 68 (46) (5) P-value 0.0001Figure shows the percent change from baseline in Total Symptom Score for each patient at Week 24 (JAKAFI = 129, placebo = 103) or the last evaluation on randomized therapy prior to Week 24 for patients who did not complete 24 weeks of randomized treatment (JAKAFI = 16, placebo = 42). Results are excluded for patients with baseline Total Symptom Score of zero, patients with missing baseline, and patients with insufficient post baseline data.Worsening of Total Symptom Score is truncated at 150%.Figure displays the proportion of patients with at least 50% improvement in each of the individual symptoms that comprise the Total Symptom Score, indicating that all of the symptoms contributed to the higher Total Symptom Score response rate in the group treated with JAKAFI.Individual score range 0 to 10An exploratory analysis of patients receiving JAKAFI also showed improvement in fatigue-related symptoms (i.e., tiredness, exhaustion, mental tiredness, and lack of energy) and associated impacts on daily activities (i.e., activity limitations related to work, self-care, and exercise) as measured by the PROMIS(R) Fatigue 7-text short form total score at Week 24. Patients who achieved reduction of 4.5 points or more from baseline to Week 24 in the PROMIS(R) Fatigue total score were considered to have achieved fatigue response. Fatigue response was reported in 35% of patients in the JAKAFI group versus 14% of the patients in the placebo group.Overall survival was secondary endpoint in both Study and Study 2. Patients in the control groups were eligible for crossover in both studies, and the median times to crossover were months in Study and 17 months in Study 2.Figure and Figure show Kaplan-Meier curves of overall survival at prospectively planned analyses after all patients remaining on study had completed 144 weeks on study.. Figure 1: Percent Change From Baseline in Spleen Volume at Week 24 or Last Observation for Each Patient (Study 1). Figure 2: Percent Change From Baseline in Total Symptom Score at Week 24 or Last Observation for Each Patient (Study 1). Figure 3: Proportion of Patients With Myelofibrosis Achieving 50% or Greater Reduction in Individual Symptom Scores at Week 24. Overall Survival Kaplan-Meier Curves by Treatment Group in Study 1. Overall Survival Kaplan Meier Curves by Treatment Group in Study 2. 14.2Polycythemia Vera. The effectiveness of JAKAFI XR has been established for polycythemia vera based on adequate and well-controlled studies of JAKAFI in adult patients with polycythemia vera. Below is display of the efficacy results of the adequate and well-controlled studies of JAKAFI in adult patients with polycythemia vera.Study (NCT01243944) was randomized, open-label, active-controlled Phase study conducted in 222 patients with PV. Patients had been diagnosed with PV for at least 24 weeks, had an inadequate response to or were intolerant of hydroxyurea, required phlebotomy, and exhibited splenomegaly. All patients were required to demonstrate hematocrit control between 40-45% prior to randomization. The age ranged from 33 to 90 years with 30% of patients over 65 years of age, and 66% were male. Patients had median spleen volume as measured by MRI or CT of 1272 cm3 (range: 254 cm3 to 5147 cm3) and median palpable spleen length below the costal margin was cm.Patients were randomized to JAKAFI or BAT. The starting dose of JAKAFI was 10 mg twice daily. Doses were then individualized based upon tolerability and efficacy with maximum dose of 25 mg twice daily. At Week 32, 98 patients were still on JAKAFI with 8% receiving greater than 20 mg twice daily, 15% receiving 20 mg twice daily, 33% receiving 15 mg twice daily, 34% receiving 10 mg twice daily, and 10% receiving less than 10 mg twice daily. Best available therapy was selected by the investigator on patient-by-patient basis and included hydroxyurea (60%), interferon/pegylated interferon (12%), anagrelide (7%), pipobroman (2%), lenalidomide/thalidomide (5%), and observation (15%).The primary endpoint was the proportion of subjects achieving response at Week 32, with response defined as having achieved both hematocrit control (the absence of phlebotomy eligibility beginning at the Week visit and continuing through Week 32) and spleen volume reduction (a greater than or equal to 35% reduction from baseline in spleen volume at Week 32). Phlebotomy eligibility was defined as confirmed hematocrit greater than 45% that is at least 3% higher than the hematocrit obtained at baseline or confirmed hematocrit greater than 48%, whichever was lower. Secondary endpoints included the proportion of all randomized subjects who achieved the primary endpoint and who maintained their response 48 weeks after randomization, and the proportion of subjects achieving complete hematological remission at Week 32 with complete hematological remission defined as achieving hematocrit control, platelet count less than or equal to 400 109/L, and white blood cell count less than or equal to 10 109/L.Results of the primary and secondary endpoints are presented in Table 25. significantly larger proportion of patients on the JAKAFI arm achieved response for the primary endpoint compared to BAT at Week 32 and maintained their response 48 weeks after randomization. significantly larger proportion of patients on the JAKAFI arm compared to BAT also achieved complete hematological remission at Week 32.Table 25: Percent of Patients With Polycythemia Vera Achieving the Primary and Key Secondary Endpoints in Study (Intent to Treat) JAKAFI (N 110) Best Available Therapy (N 112)Number (%) of Patients Achieving Primary ResponsePrimary Response defined as having achieved both the absence of phlebotomy eligibility beginning at the Week visit and continuing through Week 32 and greater than or equal to 35% reduction from baseline in spleen volume at Week 32. at Week 32 25 (23) (< 1)95% CI of the response rate (%) (15, 32) (0, 5)P-value 0.0001Number (%) of Patients Achieving Durable Primary Response at Week 48 22 (20) (< 1)95% CI of the response rate (%) (13, 29) (0, 5)P-value 0.0001Number (%) of Patients Achieving Complete Hematological Remission at Week 32 26 (24)9 (8)95% CI of the response rate (%) (16, 33) (4, 15)P-value 0.0016Additional analyses for Study to assess durability of response were conducted at Week 80 only in the JAKAFI arm. On this arm, 91 (83%) patients were still on treatment at the time of the Week 80 data cut-off. Of the 25 patients who achieved primary response at Week 32, 19 (76% of the responders) maintained their response through Week 80, and of the 26 patients who achieved complete hematological remission at Week 32, 15 (58% of the responders) maintained their response through Week 80. In an assessment of the individual components that make up the primary endpoint, there were 66 (60%) patients with hematocrit control on the JAKAFI arm versus 21 (19%) patients on BAT at Week 32; 51 (77% of hematocrit responders) patients on the JAKAFI arm maintained hematocrit control through Week 80. There were 44 (40%) patients with spleen volume reduction from baseline greater than or equal to 35% on the JAKAFI arm versus (< 1%) patient on BAT at Week 32; 43 (98% of spleen volume reduction responders) patients on the JAKAFI arm maintained spleen volume reduction through Week 80.. 14.3Acute Graft-Versus-Host Disease. The effectiveness of JAKAFI XR has been established for acute graft-versus-host-disease (aGVHD) based on adequate and well-controlled studies of JAKAFI in adult patients with aGVHD. Below is display of the efficacy results of the adequate and well-controlled studies of JAKAFI in adult patients with aGVHD.Study (NCT02953678) was an open-label, single-arm, multicenter study of JAKAFI for treatment of patients with steroid-refractory aGVHD Grades to (Mount Sinai Acute GVHD International Consortium [MAGIC] criteria) occurring after allogeneic hematopoietic stem cell transplantation. JAKAFI was administered at mg twice daily, and the dose could be increased to 10 mg twice daily after days in the absence of toxicity.There were 49 patients with aGVHD refractory to steroids alone. These patients had median age of 57 years (range: 18 to 72 years), 47% were male, 92% were Caucasian, and 14% were Hispanic. At baseline, aGVHD was Grade in 27%, Grade in 55%, and Grade in 18%; 84% had visceral GVHD; the median MAGIC biomarker score was 0.47 (range: 0.10 to 0.92); and the median ST2 level was 334 mcg/L (range: 55 to 1286 mcg/L). The median duration of prior corticosteroid exposure at baseline was 15 days (range: to 106 days).The efficacy of JAKAFI was based on Day-28 overall response rate (ORR) (complete response, very good partial response, or partial response by Center for International Blood and Marrow Transplant Research [CIBMTR] criteria) and the duration of response. The ORR results are presented in Table 26; Day-28 ORR was 100% for Grade GVHD, 40.7% for Grade GVHD, and 44.4% for Grade GVHD. The median duration of response, calculated from Day-28 response to progression, new salvage therapy for aGVHD or death from any cause (with progression being defined as worsening by stage in any organ without improvement in other organs in comparison to prior response assessment) was 16 days (95% CI 9, 83). Also, for the Day-28 responders, the median time from Day-28 response to either death or need for new therapy for aGVHD (additional salvage therapy or increase in steroids) was 173 days (95% CI 66, NE).Table 26: Day-28 Overall Response Rate for Patients With Steroid-Refractory Acute GVHD in Study Refractory to Steroids Alone (n 49) Overall Response, (%) (95% CI)28 (57.1) (42.2, 71.2)Complete Response, (%)15 (30.6)Very Good Partial Response, (%)2 (4.1)Partial Response, (%)11 (22.4). 14.4 Chronic Graft-Versus-Host Disease. The effectiveness of JAKAFI XR has been established for chronic graft-versus-host-disease (cGVHD) based on adequate and well-controlled studies of JAKAFI in adult and pediatric patients with cGVHD. Below is display of the efficacy results of the adequate and well-controlled studies of JAKAFI in adult and pediatric patients with cGVHD.Study (REACH-3; NCT03112603) was randomized, open-label, multicenter study of JAKAFI in comparison to BAT for treatment of corticosteroid-refractory cGVHD after allogeneic stem cell transplantation. Eligible patients were >= 12 years old with moderate or severe cGVHD as defined by NIH Consensus Criteria requiring additional therapy after failure of corticosteroid therapy and no more than additional salvage treatment. Patients were excluded if they had ANC 1 Gi/L and platelet count 25 Gi/L, estimated creatinine clearance 30 ml/min, progressive onset cGVHD, oxygen saturation 90%, total bilirubin 2 mg/dL, or diarrhea due to GVHD. total of 329 patients were randomized 1:1 to receive either JAKAFI 10 mg twice daily (n 165) or BAT (n 164). Best available therapy was selected by the investigator prior to randomization and included the following treatments: extracorporeal photopheresis (ECP), low-dose methotrexate (MTX), mycophenolate mofetil (MMF), mTOR inhibitors (everolimus or sirolimus), infliximab, rituximab, pentostatin, imatinib, or ibrutinib. Randomization was stratified by cGVHD severity (moderate versus severe). On Cycle Day and thereafter, patients randomized to BAT could cross over to JAKAFI if they had disease progression, mixed response, unchanged response, cGVHD flare, or toxicity to BAT. All patients also received standard supportive care, including anti-infective medications. GVHD prophylaxis and cGVHD treatment medications initiated before randomization, including systemic corticosteroids, calcineurin inhibitors, and topical or inhaled corticosteroid therapy, were allowed to be continued per institutional guidelines. Table 27 shows the demographics and baseline disease characteristics of the randomized population.Table 27:REACH-3: Demographics and Baseline Chronic GVHD Characteristics JAKAFI (N 165) Best Available Therapy (N 164) Median Age, Years (range) 49 (13, 73)50 (12, 76) Age 12 to 18 Years, (%) (2) (5) Age 65 Years, (%) 18 (11) 22 (13) Male, (%) 109 (66) 92 (56) Race, (%) White 116 (70) 132 (81) Black (1) Asian 33 (20) 21 (13) American Indian or Alaska native (1) Other (6) (2) Unknown (2) (4) Median (range) time (days) from cGVHD diagnosis to randomization 174 (7-2017) 150 (10-1947) Prior Therapy No prior treatment for cGVHD (1) (1) Failed first-line steroids alone 115 (70) 125 (76) Failed first-line combination including steroids 42 (25) 30 (18) Failed two lines of therapy (4) (5) >= Organs involved, (%) 67 (41) 63 (38) Severe cGVHD, (%) 86 (52) 79 (48) Median (range) cGVHD Total Symptom Score 19 (0-80) 18 (1-54) Median (range) corticosteroid dose at baseline (PE mg/kg)Prednisone equivalent milligrams/kilogram 0.29 (0.01-1.81) 0.26 (0.06-1.21)The efficacy of JAKAFI was based on ORR through Cycle Day 1, where overall response included complete response or partial response according to the 2014 NIH Response Criteria and durability of the response. The ORR results are presented in Table 28; the difference in ORR between JAKAFI and BAT arms was 13% (95% CI 3, 23). The median time to first response in the responders was weeks (range: to 24) for the JAKAFI arm and weeks (range: to 25) for the BAT arm. The median duration of response, calculated from first response to progression, death, or new systemic therapies for cGVHD was 4.2 months (95% CI 3.2, 6.7) for the JAKAFI arm and 2.1 months (95% CI 1.6, 3.2) for the BAT arm; and the median time from first response to death or new systemic therapies for cGVHD was 25 months (95% CI 16.8, NE) for the JAKAFI arm and 5.6 months (95% CI 4.1, 7.8) for the BAT arm.Table 28:Overall Response Rate Through Cycle Day for Patients with Chronic GVHD in Study JAKAFI (N 165)Best Available Therapy (N 164) Overall Response, (%) (95% CI)95% CI of Overall Response Rate is estimated using Clopper-Pearson method. 116 (70) (63, 77) 94 (57) (49, 65)Complete Response, (%) 14 (8)8 (5)Partial Response, (%)102 (62)86 (52)ORR results were supported by exploratory analyses of patient-reported symptom severity which showed at least 7-point decrease in the cGVHD Total Symptom Score at any time through Cycle Day in 66 (40%; 95% CI 32, 48) patients in the JAKAFI arm and 47 (29%; 95% CI 22, 36) patients in the BAT arm.

SPL PATIENT PACKAGE INSERT SECTION.

PATIENT INFORMATIONJAKAFI(R) (JAK-ah-fye)(ruxolitinib)tablets, for oral useJAKAFI XR(TM) (JAK-ah-fye EKS-AHR)(ruxolitinib)extended-release tablets, for oral use What is JAKAFI or JAKAFI XRJAKAFI or JAKAFI XR is prescription medicine used to treat:adults with certain types of myelofibrosis (MF).adults with polycythemia vera (PV) who have already taken medicine called hydroxyurea and it did not work well enough or they could not tolerate it.adults and children 12 years of age and older with acute graft-versus-host-disease (aGVHD) who have taken corticosteroids and they did not work well enough.adults and children 12 years of age and older with chronic graft-versus-host-disease (cGVHD) who have taken one or two types of treatments and they did not work well enough.It is not known if JAKAFI or JAKAFI XR is safe and effective in children for treatment of MF or PV.Before taking JAKAFI or JAKAFI XR, tell your healthcare provider about all of your medical conditions, including if you: have or have had low white or red blood cell countshave an infectionhave or had tuberculosis (TB), or have been in close contact with someone who has TBhave had shingles (herpes zoster)have or had hepatitis Bhave high level of fat in your blood (high blood cholesterol or triglycerides)have had blood clot, heart attack, other heart problems, or strokeare current or past smokerhave had cancer in the pasthave or have had kidney problems or are on dialysis. If you are on dialysis, JAKAFI or JAKAFI XR should be taken after your dialysis.have or have had liver problemsare pregnant or plan to become pregnant. It is not known if JAKAFI or JAKAFI XR will harm your unborn baby.are breastfeeding or plan to breastfeed. It is not known if JAKAFI or JAKAFI XR passes into your breast milk. Do not breastfeed during treatment with JAKAFI or JAKAFI XR and for weeks after the final dose.Tell your healthcare provider about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements. Taking JAKAFI or JAKAFI XR with certain other medicines may affect how JAKAFI or JAKAFI XR works. Know the medicines you take. Keep list of them to show your healthcare provider and pharmacist when you get new medicine. How should take JAKAFI or JAKAFI XRTake JAKAFI or JAKAFI XR exactly as your healthcare provider tells you.Do not change your dose or stop taking JAKAFI or JAKAFI XR without first talking to your healthcare provider. If you stop treatment with JAKAFI or JAKAFI XR, symptoms of your condition may return. See What are the possible side effects of JAKAFI or JAKAFI XRIf you are prescribed JAKAFI:take JAKAFI times day or exactly as your healthcare provider tells you, with or without food.JAKAFI may also be given through certain nasogastric tubes. Tell your healthcare provider if you cannot take JAKAFI by mouth. Your healthcare provider will decide if you can take JAKAFI through nasogastric tube.Ask your healthcare provider to give you specific instructions on how to properly take JAKAFI through nasogastric tube. If you are prescribed JAKAFI XR: take JAKAFI XR time day with or without food. swallow JAKAFI XR whole. Do not split, chew, or crush.If you miss dose of JAKAFI or JAKAFI XR, take your next dose at your regular time. Do not take doses at the same time.If you take too much JAKAFI or JAKAFI XR call your healthcare provider or go to the nearest hospital emergency room right away.You will have regular blood tests during your treatment with JAKAFI or JAKAFI XR. Your healthcare provider may change your dose of JAKAFI or JAKAFI XR or stop your treatment based on the results of your blood tests.What are the possible side effects of JAKAFI or JAKAFI XRJAKAFI or JAKAFI XR can cause serious side effects including:o Low blood cell counts. JAKAFI or JAKAFI XR can cause low platelet counts (thrombocytopenia), low red blood cell counts (anemia), and low white blood cell counts (neutropenia). If you develop bleeding, stop JAKAFI or JAKAFI XR and call your healthcare provider. Your healthcare provider will do blood test to check your blood cell counts before you start JAKAFI or JAKAFI XR and regularly during your treatment with JAKAFI or JAKAFI XR. Tell your healthcare provider right away if you develop or have worsening of any of these symptoms: unusual bleedingbruisingtirednessshortness of breathfevero Infection. You may be at risk for developing serious infection during treatment with JAKAFI or JAKAFI XR. Tell your healthcare provider if you develop any of the following symptoms of infection:chillsachesfevernauseavomitingweaknesspainful skin rash or blisterso Worsening of symptoms after interrupting or stopping treatment. Signs and symptoms of myelofibrosis may worsen after you stop treatment with JAKAFI or JAKAFI XR. Do not interrupt or stop treatment with JAKAFI or JAKAFI XR without talking to your healthcare provider. If you need to stop treatment with JAKAFI or JAKAFI XR, your healthcare provider may give you instructions for slowly stopping treatment. Tell your healthcare provider right away if you get any of the following signs and symptoms after stopping treatment with JAKAFI or JAKAFI XR: fevertrouble breathingfeeling dizzy or lightheadedweaknessnight sweatspain in left upper stomach (abdomen) area or left shouldero Cancer. Some people have had certain types of non-melanoma skin cancers during treatment with JAKAFI or JAKAFI XR. Your healthcare provider will regularly check your skin during your treatment with JAKAFI or JAKAFI XR. Tell your healthcare provider if you develop any new or changing skin lesions during treatment with JAKAFI or JAKAFI XR. Cholesterol increases. JAKAFI or JAKAFI XR may increase your blood cholesterol levels. Your healthcare provider will do blood tests to check your cholesterol levels about every to 12 weeks after you start taking JAKAFI or JAKAFI XR, and as needed.o Increased risk of major cardiovascular events such as heart attack, stroke, or death in people who have cardiovascular risk factors and who are current or past smokers while using another JAK inhibitor to treat rheumatoid arthritis. Get emergency help right away if you get any symptoms of heart attack or stroke during treatment with JAKAFI or JAKAFI XR, including:discomfort in the center of your chest that lasts for more than few minutes, or that goes away and comes backsevere tightness, pain, pressure, or heaviness in your chest, throat, neck, or jawpain or discomfort in your arms, back, neck, jaw, or stomachshortness of breath with or without chest discomfortbreaking out in cold sweatnausea or vomitingfeeling lightheadedweakness in one part or on one side of your bodyslurred speecho Increased risk of blood clots. Blood clots in the veins of your legs (deep vein thrombosis, DVT) or lungs (pulmonary embolism, PE) have happened in people taking another JAK inhibitor for rheumatoid arthritis and may be life-threatening. Tell your healthcare provider right away if you have any signs and symptoms of blood clots during treatment with JAKAFI or JAKAFI XR, including:swelling, pain or tenderness in or both legssudden, unexplained chest or upper back painshortness of breath or difficulty breathingo Possible increased risk of new (secondary) cancers. People who take another JAK inhibitor for rheumatoid arthritis have an increased risk of new (secondary) cancers, including lymphoma and other cancers. People who smoke or who smoked in the past have an added risk of new cancers. The most common side effects of JAKAFI or JAKAFI XR in adults with certain types of MF and PV include:low platelet countslow red blood cell countsbruisingdizzinessheadachediarrheaThe most common side effects of JAKAFI or JAKAFI XR in people with aGVHD include:low red blood cell countslow platelet countslow white blood cell countsinfectionsswelling The most common side effects of JAKAFI or JAKAFI XR in people with cGVHD include: low red blood cell countslow platelet counts infections, including viral infectionsThese are not all of the possible side effects of JAKAFI or JAKAFI XR. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088. You may also report side effects to Incyte Corporation at 1-855-463-3463.How should store JAKAFI or JAKAFI XRStore JAKAFI or JAKAFI XR at room temperature between 68F to 77F (20C to 25C).Tightly close the JAKAFI or JAKAFI XR bottle after you take your dose.Keep JAKAFI or JAKAFI XR bottle tightly closed to protect from light.Keep JAKAFI and JAKAFI XR and all medicines out of the reach of children. General information about the safe and effective use of JAKAFI or JAKAFI XR. Medicines are sometimes prescribed for purposes other than those listed in Patient Information leaflet. Do not use JAKAFI or JAKAFI XR for condition for which it is not prescribed. Do not give JAKAFI or JAKAFI XR to other people, even if they have the same symptoms you have. It may harm them. You can ask your pharmacist or healthcare provider for information that is written for healthcare professionals. What are the ingredients in JAKAFI Active ingredient: ruxolitinib phosphateInactive ingredients: colloidal silicon dioxide, hydroxypropyl cellulose, lactose monohydrate, magnesium stearate, microcrystalline cellulose, povidone and sodium starch glycolate. What are the ingredients in JAKAFI XR Active ingredient: ruxolitinib phosphateInactive ingredients: colloidal silicon dioxide, hypromellose, lactose monohydrate, magnesium stearate, microcrystalline cellulose and sodium stearyl fumarate. Manufactured for: Incyte Corporation, 1801 Augustine Cut-off, Wilmington, DE 19803 JAKAFI is registered trademark of Incyte. JAKAFI XR is trademark of Incyte. Patent Information: www.incyte.com/patents (C) 2011-2026 Incyte Corporation. For more information call 1-855-463-3463 or go to www.jakafi.com.This Patient Information has been approved by the U.S. Food and Drug Administration. Issued: 5/2026 adults with certain types of myelofibrosis (MF).. adults with polycythemia vera (PV) who have already taken medicine called hydroxyurea and it did not work well enough or they could not tolerate it.. adults and children 12 years of age and older with acute graft-versus-host-disease (aGVHD) who have taken corticosteroids and they did not work well enough.. adults and children 12 years of age and older with chronic graft-versus-host-disease (cGVHD) who have taken one or two types of treatments and they did not work well enough.. have or have had low white or red blood cell counts. have an infection. have or had tuberculosis (TB), or have been in close contact with someone who has TB. have had shingles (herpes zoster). have or had hepatitis B. have high level of fat in your blood (high blood cholesterol or triglycerides). have had blood clot, heart attack, other heart problems, or stroke. are current or past smoker. have had cancer in the past. have or have had kidney problems or are on dialysis. If you are on dialysis, JAKAFI or JAKAFI XR should be taken after your dialysis.. have or have had liver problems. are pregnant or plan to become pregnant. It is not known if JAKAFI or JAKAFI XR will harm your unborn baby.. are breastfeeding or plan to breastfeed. It is not known if JAKAFI or JAKAFI XR passes into your breast milk. Do not breastfeed during treatment with JAKAFI or JAKAFI XR and for weeks after the final dose.. Take JAKAFI or JAKAFI XR exactly as your healthcare provider tells you.. Do not change your dose or stop taking JAKAFI or JAKAFI XR without first talking to your healthcare provider. If you stop treatment with JAKAFI or JAKAFI XR, symptoms of your condition may return. See What are the possible side effects of JAKAFI or JAKAFI XR. If you are prescribed JAKAFI:take JAKAFI times day or exactly as your healthcare provider tells you, with or without food.JAKAFI may also be given through certain nasogastric tubes. Tell your healthcare provider if you cannot take JAKAFI by mouth. Your healthcare provider will decide if you can take JAKAFI through nasogastric tube.Ask your healthcare provider to give you specific instructions on how to properly take JAKAFI through nasogastric tube. take JAKAFI times day or exactly as your healthcare provider tells you, with or without food.. JAKAFI may also be given through certain nasogastric tubes. Tell your healthcare provider if you cannot take JAKAFI by mouth. Your healthcare provider will decide if you can take JAKAFI through nasogastric tube.Ask your healthcare provider to give you specific instructions on how to properly take JAKAFI through nasogastric tube. Tell your healthcare provider if you cannot take JAKAFI by mouth. Your healthcare provider will decide if you can take JAKAFI through nasogastric tube.. Ask your healthcare provider to give you specific instructions on how to properly take JAKAFI through nasogastric tube.. If you are prescribed JAKAFI XR: take JAKAFI XR time day with or without food. swallow JAKAFI XR whole. Do not split, chew, or crush.. take JAKAFI XR time day with or without food. swallow JAKAFI XR whole. Do not split, chew, or crush.. If you miss dose of JAKAFI or JAKAFI XR, take your next dose at your regular time. Do not take doses at the same time.. If you take too much JAKAFI or JAKAFI XR call your healthcare provider or go to the nearest hospital emergency room right away.. You will have regular blood tests during your treatment with JAKAFI or JAKAFI XR. Your healthcare provider may change your dose of JAKAFI or JAKAFI XR or stop your treatment based on the results of your blood tests.. unusual bleeding. bruising. tiredness. shortness of breath. fever. chills. aches. fever. nausea. vomiting. weakness. painful skin rash or blisters. fever. trouble breathing. feeling dizzy or lightheaded. weakness. night sweats. pain in left upper stomach (abdomen) area or left shoulder. discomfort in the center of your chest that lasts for more than few minutes, or that goes away and comes back. severe tightness, pain, pressure, or heaviness in your chest, throat, neck, or jaw. pain or discomfort in your arms, back, neck, jaw, or stomach. shortness of breath with or without chest discomfort. breaking out in cold sweat. nausea or vomiting. feeling lightheaded. weakness in one part or on one side of your body. slurred speech. swelling, pain or tenderness in or both legs. sudden, unexplained chest or upper back pain. shortness of breath or difficulty breathing. low platelet counts. low red blood cell counts. bruising. dizziness. headache. diarrhea. low red blood cell counts. low platelet counts. low white blood cell counts. infections. swelling. low red blood cell counts. low platelet counts infections, including viral infections. Store JAKAFI or JAKAFI XR at room temperature between 68F to 77F (20C to 25C).. Tightly close the JAKAFI or JAKAFI XR bottle after you take your dose.. Keep JAKAFI or JAKAFI XR bottle tightly closed to protect from light.

USE IN SPECIFIC POPULATIONS SECTION.

8 USE IN SPECIFIC POPULATIONS. Renal Impairment: Reduce JAKAFI/JAKAFI XR starting dose or avoid treatment as recommended. (2.7, 8.6)Hepatic Impairment: Reduce JAKAFI/JAKAFI XR starting dose or avoid treatment as recommended. (2.7, 8.7)Lactation: Advise not to breastfeed. (8.2). Renal Impairment: Reduce JAKAFI/JAKAFI XR starting dose or avoid treatment as recommended. (2.7, 8.6). Hepatic Impairment: Reduce JAKAFI/JAKAFI XR starting dose or avoid treatment as recommended. (2.7, 8.7). Lactation: Advise not to breastfeed. (8.2). 8.1 Pregnancy. Risk SummaryWhen pregnant rats and rabbits were administered ruxolitinib during the period of organogenesis adverse developmental outcomes occurred at doses associated with maternal toxicity (see Data). There are no studies with the use of JAKAFI/JAKAFI XR in pregnant women to inform drug-associated risks. The background risk of major birth defects and miscarriage for the indicated populations is unknown. Adverse outcomes in pregnancy occur regardless of the health of the mother or the use of medications. The background risk in the U.S. general population of major birth defects is 2% to 4% and miscarriage is 15% to 20% of clinically recognized pregnancies.DataAnimal DataRuxolitinib was administered orally to pregnant rats or rabbits during the period of organogenesis, at doses of 15, 30, or 60 mg/kg/day in rats and 10, 30, or 60 mg/kg/day in rabbits. There were no treatment-related malformations. Adverse developmental outcomes, such as decreases of approximately 9% in fetal weights were noted in rats at the highest and maternally toxic dose of 60 mg/kg/day. This dose results in an exposure (AUC) that is approximately times the clinical exposure at the maximum recommended dose of 25 mg twice daily. In rabbits, lower fetal weights of approximately 8% and increased late resorptions were noted at the highest and maternally toxic dose of 60 mg/kg/day. This dose is approximately 7% of the clinical exposure at the maximum recommended dose.In pre- and post-natal development study in rats, pregnant animals were dosed with ruxolitinib from implantation through lactation at doses up to 30 mg/kg/day. There were no drug-related adverse findings in pups for fertility indices or for maternal or embryofetal survival, growth, and development parameters at the highest dose evaluated (34% the clinical exposure at the maximum recommended dose of 25 mg twice daily).. 8.2 Lactation. Risk SummaryNo data are available regarding the presence of ruxolitinib in human milk, the effects on the breast-fed child, or the effects on milk production. Ruxolitinib and/or its metabolites were present in the milk of lactating rats (see Data). Because many drugs are present in human milk and because of the potential for thrombocytopenia and anemia shown for JAKAFI in human studies, discontinue breastfeeding during treatment with JAKAFI/JAKAFI XR and for weeks after the final dose. DataAnimal DataLactating rats were administered single dose of [14C]-labeled ruxolitinib (30 mg/kg) on postnatal Day 10, after which plasma and milk samples were collected for up to 24 hours. The AUC for total radioactivity in milk was approximately 13-fold the maternal plasma AUC. Additional analysis showed the presence of ruxolitinib and several of its metabolites in milk, all at levels higher than those in maternal plasma.. 8.4 Pediatric Use. MyelofibrosisThe safety and effectiveness of JAKAFI/JAKAFI XR for treatment of MF in pediatric patients have not been established.Polycythemia VeraThe safety and effectiveness of JAKAFI/JAKAFI XR for treatment of PV in pediatric patients have not been established.Acute Graft-Versus-Host DiseaseThe safety and effectiveness of JAKAFI for treatment of steroid-refractory aGVHD has been established for treatment of pediatric patients 12 years and older. Use of JAKAFI in pediatric patients with steroid-refractory aGVHD is supported by evidence from adequate and well-controlled trials of JAKAFI in adults see Clinical Studies 14.3 )] and additional pharmacokinetic and safety data in pediatric patients. The safety and effectiveness of JAKAFI/JAKAFI XR for treatment of steroid-refractory aGVHD has not been established in pediatric patients younger than 12 years old.Chronic Graft-Versus-Host DiseaseThe safety and effectiveness of JAKAFI for treatment of cGVHD after failure of one or two lines of systemic therapy has been established for treatment of pediatric patients 12 years and older. Use of JAKAFI in pediatric patients with cGVHD after failure of one or two lines of systemic therapy is supported by evidence from adequate and well-controlled trials of JAKAFI in adults and adolescents see Clinical Studies 14.4 )] and additional pharmacokinetic and safety data in pediatric patients. The safety and effectiveness of JAKAFI/JAKAFI XR for treatment of cGVHD has not been established in pediatric patients younger than 12 years old.Other Myeloproliferative Neoplasms, Leukemias, and Solid TumorsThe safety and effectiveness of ruxolitinib were assessed but not established in single-arm trial (NCT01164163) in patients with relapsed or refractory solid tumors, leukemias, or myeloproliferative neoplasms. The patients included 18 children (age to 12 years) and 14 adolescents (age 12 to 17 years). Overall, 19% of patients received more than cycle. No new safety signals were observed in pediatric patients in this trial.The safety and effectiveness of ruxolitinib in combination with chemotherapy for treatment of high-risk, de novo CRLF2 rearranged or JAK pathway-mutant Ph-like acute lymphoblastic leukemia (ALL) were assessed but not established in single-arm trial (NCT02723994). The patients included infants (age 2 years), 42 children (age to 12 years) and 62 adolescents (age 12 to 17 years). No new safety signals were observed in pediatric patients in this trial.Juvenile Animal Toxicity DataAdministration of ruxolitinib to juvenile rats resulted in effects on growth and bone measures. When administered starting at postnatal Day (the equivalent of human newborn) at doses of 1.5 to 75 mg/kg/day, evidence of fractures occurred at doses >= 30 mg/kg/day, and effects on body weight and other bone measures (eg, bone mineral content, peripheral quantitative computed tomography, and x-ray analysis) occurred at doses >= mg/kg/day. When administered starting at postnatal day 21 (the equivalent of human 2-3 years of age) at doses of to 60 mg/kg/day, effects on body weight and bone occurred at doses >= 15 mg/kg/day, which were considered adverse at 60 mg/kg/day. Males were more severely affected than females in all age groups, and effects were generally more severe when administration was initiated earlier in the postnatal period. These findings were observed at exposures that are at least 27% the clinical exposure at the maximum recommended dose of 25 mg twice daily. 8.5 Geriatric Use. Of the total number of patients with MF in clinical studies with JAKAFI, 52% were 65 years and older, while 15% were 75 years and older. No overall differences in safety or effectiveness of JAKAFI were observed between these patients and younger patients.Clinical studies of JAKAFI in patients with aGVHD did not include sufficient numbers of subjects age 65 and over to determine whether they respond differently from younger subjects. Of the total number of patients with cGVHD treated with JAKAFI in clinical trials, 11% were 65 years and older. No overall differences in safety or effectiveness of JAKAFI were observed between these patients and younger patients.. 8.6 Renal Impairment. Total exposure of ruxolitinib and its active metabolites increased with moderate (CLcr 30 to 59 mL/min) and severe (CLcr 15 to 29 mL/min) renal impairment, and ESRD (CLcr less than 15 mL/min) on dialysis [see Clinical Pharmacology 12.3 )]. Modify JAKAFI/JAKAFI XR dosage as recommended [see Dosage and Administration (2.7 )]. 8.7 Hepatic Impairment. Exposure of ruxolitinib increased with mild (Child-Pugh A), moderate (Child-Pugh B), and severe (Child-Pugh C) hepatic impairment [see Clinical Pharmacology 12.3)]. Reduce JAKAFI/JAKAFI XR dosage as recommended in patients with MF or PV with hepatic impairment see Dosage and Administration (2.7 ] Reduce JAKAFI dosage as recommended for patients with Stage liver aGVHD. Monitor blood counts more frequently for toxicity and modify the JAKAFI/JAKAFI XR dosage for adverse reactions if they occur for patients with Score liver cGVHD see Dosage and Administration (2.7 and Clinical Pharmacology 12.3 )].

WARNINGS AND PRECAUTIONS SECTION.

5 WARNINGS AND PRECAUTIONS. Thrombocytopenia, Anemia, and Neutropenia: Manage by dose reduction or interruption, or transfusion. (5.1)Risk of Infection: Assess patients for signs and symptoms of infection and initiate appropriate treatment promptly. Serious infections should have resolved before starting therapy with JAKAFI/JAKAFI XR. (5.2)Symptom Exacerbation Following Interruption or Discontinuation: Manage with supportive care and consider resuming treatment with JAKAFI/JAKAFI XR. (5.3) Risk of Non-Melanoma Skin Cancer: Perform periodic skin examinations. (5.4)Lipid Elevations: Assess lipid levels to 12 weeks from start of therapy and treat as needed. (5.5)Major Adverse Cardiovascular Events (MACE): Monitor for development of MACE. (5.6)Thrombosis: Evaluate and treat symptoms of thrombosis promptly. (5.7)Secondary Malignancies: Monitor for development of secondary malignancies, particularly in patients who are current or past smokers. (5.8). Thrombocytopenia, Anemia, and Neutropenia: Manage by dose reduction or interruption, or transfusion. (5.1). Risk of Infection: Assess patients for signs and symptoms of infection and initiate appropriate treatment promptly. Serious infections should have resolved before starting therapy with JAKAFI/JAKAFI XR. (5.2). Symptom Exacerbation Following Interruption or Discontinuation: Manage with supportive care and consider resuming treatment with JAKAFI/JAKAFI XR. (5.3) Risk of Non-Melanoma Skin Cancer: Perform periodic skin examinations. (5.4). Lipid Elevations: Assess lipid levels to 12 weeks from start of therapy and treat as needed. (5.5). Major Adverse Cardiovascular Events (MACE): Monitor for development of MACE. (5.6). Thrombosis: Evaluate and treat symptoms of thrombosis promptly. (5.7). Secondary Malignancies: Monitor for development of secondary malignancies, particularly in patients who are current or past smokers. (5.8). 5.1 Thrombocytopenia, Anemia and Neutropenia. Treatment with JAKAFI/JAKAFI XR can cause thrombocytopenia, anemia, and neutropenia see Adverse Reactions 6.1 )].Manage thrombocytopenia by reducing the dose or temporarily interrupting JAKAFI/JAKAFI XR. Platelet transfusions may be necessary see Dosage and Administration 2 ].Patients developing anemia may require blood transfusions and/or dose modifications of JAKAFI/JAKAFI XR.Severe neutropenia (ANC less than 0.5 109/L) was generally reversible by withholding JAKAFI/JAKAFI XR until recovery.Perform pre-treatment CBC and monitor CBCs every to weeks until doses are stabilized, and then as clinically indicated see Dosage and Administration 2 )]. 5.2 Risk of Infection. Serious bacterial, mycobacterial, fungal, and viral infections have occurred see Adverse Reactions 6.1 )]. Delay starting therapy with JAKAFI/JAKAFI XR until active serious infections have resolved. Observe patients receiving JAKAFI/JAKAFI XR for signs and symptoms of infection and manage promptly. Use active surveillance and prophylactic antibiotics according to clinical guidelines.TuberculosisTuberculosis infection has been reported in patients receiving JAKAFI. Observe patients receiving JAKAFI/JAKAFI XR for signs and symptoms of active tuberculosis and manage promptly.Prior to initiating JAKAFI/JAKAFI XR, patients should be evaluated for tuberculosis risk factors, and those at higher risk should be tested for latent infection. Risk factors include, but are not limited to, prior residence in or travel to countries with high prevalence of tuberculosis, close contact with person with active tuberculosis, and history of active or latent tuberculosis where an adequate course of treatment cannot be confirmed.For patients with evidence of active or latent tuberculosis, consult physician with expertise in the treatment of tuberculosis before starting JAKAFI/JAKAFI XR. The decision to continue JAKAFI/JAKAFI XR during treatment of active tuberculosis should be based on the overall risk-benefit determination.Progressive Multifocal LeukoencephalopathyProgressive multifocal leukoencephalopathy (PML) has occurred with JAKAFI treatment. If PML is suspected, stop JAKAFI/JAKAFI XR and evaluate.Herpes Zoster and Herpes SimplexHerpes zoster infection has been reported in patients receiving JAKAFI [see Adverse Reactions (6.1)]. Advise patients about early signs and symptoms of herpes zoster and to seek treatment as early as possible if suspected.Herpes simplex virus reactivation and/or dissemination has been reported in patients receiving JAKAFI [see Adverse Reactions (6.2)]. Monitor patients for the development of herpes simplex infections. If patient develops evidence of dissemination of herpes simplex, consider interrupting treatment with JAKAFI/JAKAFI XR; patients should be promptly treated and monitored according to clinical guidelines.Hepatitis BHepatitis viral load (HBV-DNA titer) increases, with or without associated elevations in alanine aminotransferase and aspartate aminotransferase, have been reported in patients with chronic HBV infections taking JAKAFI. The effect of JAKAFI/JAKAFI XR on viral replication in patients with chronic HBV infection is unknown. Patients with chronic HBV infection should be treated and monitored according to clinical guidelines.. 5.3 Symptom Exacerbation Following Interruption orDiscontinuation of Treatment. Following discontinuation of JAK-inhibitors, including JAKAFI/JAKAFI XR, signs and symptoms from myeloproliferative neoplasms may flare. Some patients with MF have experienced one or more of the following after discontinuing JAK-inhibitors: fever, respiratory distress, hypotension, disseminated intravascular coagulation, or multi-organ failure. If one or more of these signs and symptoms occur after discontinuation of JAKAFI/JAKAFI XR, or while tapering the dose, evaluate for and treat any intercurrent illness and consider restarting or increasing the dose of JAKAFI/JAKAFI XR. Instruct patients not to interrupt or discontinue therapy without consulting their healthcare provider. When discontinuing or interrupting therapy with JAKAFI/JAKAFI XR for reasons other than life-threatening toxicities, consider tapering the dose of JAKAFI/JAKAFI XR gradually rather than discontinuing abruptly [see Dosage and Administration (2.8)].. 5.4Non-Melanoma Skin Cancer (NMSC). Non-melanoma skin cancers including basal cell, squamous cell, and Merkel cell carcinoma have occurred in patients treated with JAKAFI/JAKAFI XR. Perform periodic skin examinations.. 5.5Lipid Elevations. Treatment with JAKAFI has been associated with increases in lipid parameters including total cholesterol, low-density lipoprotein (LDL) cholesterol, and triglycerides [see Adverse Reactions 6.1 )]. The effect of these lipid parameter elevations on cardiovascular morbidity and mortality has not been determined in patients treated with JAKAFI/JAKAFI XR. Assess lipid parameters approximately to 12 weeks following initiation of JAKAFI/JAKAFI XR therapy. Monitor and treat according to clinical guidelines for the management of hyperlipidemia.. 5.6 Major Adverse Cardiovascular Events (MACE). Another JAK inhibitor has increased the risk of MACE, including cardiovascular death, myocardial infarction, and stroke (compared to those treated with TNF blockers) in patients with rheumatoid arthritis, condition for which JAKAFI/JAKAFI XR is not indicated.Consider the benefits and risks for the individual patient prior to initiating or continuing therapy with JAKAFI/JAKAFI XR particularly in patients who are current or past smokers and patients with other cardiovascular risk factors. Patients should be informed about the symptoms of serious cardiovascular events and the steps to take if they occur.. 5.7 Thrombosis. Another JAK-inhibitor has increased the risk of thrombosis, including deep venous thrombosis (DVT), pulmonary embolism (PE), and arterial thrombosis (compared to those treated with TNF blockers) in patients with rheumatoid arthritis, condition for which JAKAFI/JAKAFI XR is not indicated. In patients with MF and PV treated with JAKAFI in clinical trials, the rates of thromboembolic events were similar in JAKAFI and control treated patients. Patients with symptoms of thrombosis should be promptly evaluated and treated appropriately.. 5.8 Secondary Malignancies. Another JAK-inhibitor has increased the risk of lymphoma and other malignancies excluding NMSC (compared to those treated with TNF blockers) in patients with rheumatoid arthritis, condition for which JAKAFI/JAKAFI XR is not indicated. Patients who are current or past smokers are at additional increased risk. Consider the benefits and risks for the individual patient prior to initiating or continuing therapy with JAKAFI/JAKAFI XR, particularly in patients with known secondary malignancy (other than successfully treated NMSC), patients who develop malignancy, and patients who are current or past smokers.