Ibrutinib

IMBRUVICA is a kinase inhibitor indicated for the treatment of: Adult patients with chronic lymphocytic leukemia (CLL)/Small lymphocytic lymphoma (SLL) ( 1.1 ). Adult patients with chronic lymphocytic leukemia (CLL)/Small lymphocytic lymphoma (SLL) with 17p deletion ( 1.2 ). Adult patients with Waldenström’s macroglobulinemia (WM) ( 1.3 ). Adult and pediatric patients age 1 year and older with chronic graft versus host disease (cGVHD) after failure of one or more lines of systemic therapy ( 1.4 ).

1.1 Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma IMBRUVICA is indicated for the treatment of adult patients with chronic lymphocytic leukemia (CLL)/small lymphocytic lymphoma (SLL). 1. 2 Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma with 17p deletion IMBRUVICA is indicated for the treatment of adult patients with chronic lymphocytic leukemia (CLL)/small lymphocytic lymphoma (SLL) with 17p deletion. 1. 3 Waldenström’s Macroglobulinemia IMBRUVICA is indicated for the treatment of adult patients with Waldenström’s macroglobulinemia (WM). 1. 4 Chronic Graft versus Host Disease IMBRUVICA is indicated for the treatment of adult and pediatric patients age 1 year and older with chronic graft-versus-host disease (cGVHD) after failure of one or more lines of systemic therapy.

Capsules: Each 70 mg capsule is a yellow, opaque capsule marked with “ibr 70 mg” in black ink. Each 140 mg capsule is a white, opaque capsule marked with “ibr 140 mg” in black ink. Tablets: Each 140 mg tablet is a yellow green to green round tablet debossed with “ibr” on one side and “140” on the other side. Each 280 mg tablet is a purple oblong tablet debossed with “ibr” on one side and “280” on the other side. Each 420 mg tablet is a yellow green to green oblong tablet debossed with “ibr” on one side and “420” on the other side. Oral Suspension: 70 mg/mL, white to off-white suspension. Capsules: 70 mg and 140 mg ( 3 ) Tablets: 140 mg, 280 mg, and 420 mg ( 3 ) Oral suspension: 70 mg/mL ( 3 )

None None ( 4 )

Hemorrhage : Monitor for bleeding and manage ( 5.1 ). Infections : Monitor patients for fever and infections, evaluate promptly, and treat ( 5.2 ). Cardiac Arrhythmias , Cardiac Failure , and Sudden Death : Monitor for symptoms of arrhythmias and cardiac failure and manage ( 5.3 ). Hypertension : Monitor blood pressure and treat ( 5.4 ). Cytopenias : Check complete blood counts monthly ( 5.5 ). Second Primary Malignancies : Other malignancies have occurred in patients, including skin cancers, and other carcinomas ( 5.6 ). Hepatotoxicity, Including Drug- Induced Liver Injury : Monitor hepatic function throughout treatment ( 5.7 ). Tumor Lysis Syndrome (TLS) : Assess baseline risk and take precautions. Monitor and treat for TLS ( 5.8 ). Embryo-Fetal Toxicity : Can cause fetal harm. Advise females of reproductive potential of the potential risk to a fetus and to use effective contraception ( 5.9 , 8.1 , 8.3 ).

5.1 Hemorrhage Fatal bleeding events have occurred in patients who received IMBRUVICA. Major hemorrhage (≥ Grade 3, serious, or any central nervous system events; e.g., intracranial hemorrhage [including subdural hematoma], gastrointestinal bleeding, hematuria, and post procedural hemorrhage) occurred in 4.2% of patients, with fatalities occurring in 0.4% of 2,838 patients who received IMBRUVICA in 27 clinical trials. Bleeding events of any grade including bruising and petechiae occurred in 39%, and excluding bruising and petechiae occurred in 23% of patients who received IMBRUVICA, respectively [see Adverse Reactions ( 6.1 )] . The mechanism for the bleeding events is not well understood. Use of either anticoagulant or antiplatelet agents concomitantly with IMBRUVICA increases the risk of major hemorrhage. Across clinical trials, 3.1% of 2,838 patients who received IMBRUVICA without antiplatelet or anticoagulant therapy experienced major hemorrhage. The addition of antiplatelet therapy with or without anticoagulant therapy increased this percentage to 4.4%, and the addition of anticoagulant therapy with or without antiplatelet therapy increased this percentage to 6.1%. Consider the risks and benefits of anticoagulant or antiplatelet therapy when co-administered with IMBRUVICA. Monitor for signs and symptoms of bleeding. Consider the benefit-risk of withholding IMBRUVICA for at least 3 to 7 days pre- and post-surgery depending upon the type of surgery and the risk of bleeding [see Clinical Studies ( 14 )].

5.2 Infections Fatal and non-fatal infections (including bacterial, viral, or fungal) have occurred with IMBRUVICA therapy. Grade 3 or greater infections occurred in 21% of 1,476 patients with B-cell malignancies who received IMBRUVICA in clinical trials [see Adverse Reactions ( 6.1 , 6.2 )] . Cases of progressive multifocal leukoencephalopathy (PML) and Pneumocystis jirovecii pneumonia (PJP) have occurred in patients treated with IMBRUVICA. Consider prophylaxis according to standard of care in patients who are at increased risk for opportunistic infections. Monitor and evaluate patients for fever and infections and treat appropriately.

5.3 Cardiac Arrhythmias, Cardiac Failure, and Sudden Death Fatal and serious cardiac arrhythmias and cardiac failure have occurred with IMBRUVICA. Deaths due to cardiac causes or sudden deaths occurred in 1% of 4,896 patients who received IMBRUVICA in clinical trials, including in patients who received IMBRUVICA in unapproved monotherapy or combination regimens. These adverse reactions occurred in patients with and without preexisting hypertension or cardiac comorbidities. Patients with cardiac comorbidities may be at greater risk of these events. Grade 3 or greater ventricular tachyarrhythmias were reported in 0.2%, Grade 3 or greater atrial fibrillation and atrial flutter were reported in 3.7%, and Grade 3 or greater cardiac failure was reported in 1.3% of 4,896 patients who received IMBRUVICA in clinical trials, including in patients who received IMBRUVICA in unapproved monotherapy or combination regimens. These events have occurred particularly in patients with cardiac risk factors including hypertension and diabetes mellitus, a previous history of cardiac arrhythmias, and in patients with acute infections [see Adverse Reactions ( 6.1 )] . Evaluate cardiac history and function at baseline, and monitor patients for cardiac arrhythmias and cardiac function. Obtain further evaluation (e.g., ECG, echocardiogram) as indicated for patients who develop symptoms of arrhythmia (e.g., palpitations, lightheadedness, syncope, chest pain), new onset dyspnea, or other cardiovascular concerns. Manage cardiac arrhythmias and cardiac failure appropriately, follow dose modification guidelines [see Dosage and Administration ( 2.2 )] , and consider the risks and benefits of continued IMBRUVICA treatment.

5.4 Hypertension Hypertension occurred in 19% of 1,476 patients with B-cell malignancies who received IMBRUVICA in clinical trials. Grade 3 or greater hypertension occurred in 8% of patients [see Adverse Reactions ( 6.1 )] . Based on data from a subset of these patients (N=1,124), the median time to onset was 5.9 months (range, 0 to 24 months). In a long-term safety analysis over 5 years of 1,284 patients with B-cell malignancies treated for a median of 36 months (range, 0 to 98 months), the cumulative rate of hypertension increased over time. The prevalence for Grade 3 or greater hypertension was 4% (year 0-1), 7% (year 1-2), 9% (year 2-3), 9% (year 3-4), and 9% (year 4-5); the overall incidence for the 5-year period was 11%. Monitor blood pressure in patients treated with IMBRUVICA, initiate or adjust anti-hypertensive medication throughout treatment with IMBRUVICA as appropriate, and follow dosage modification guidelines for Grade 3 or higher hypertension [see Dosage and Administration ( 2.2 )] .

5.5 Cytopenias In 645 patients with B-cell malignancies who received IMBRUVICA as a single agent, grade 3 or 4 neutropenia occurred in 23% of patients, grade 3 or 4 thrombocytopenia in 8% and grade 3 or 4 anemia in 2.8%, based on laboratory measurements [see Adverse Reactions ( 6.1 )] . Monitor complete blood counts monthly.

5.6 Second Primary Malignancies Other malignancies (10%), including non-skin carcinomas (3.9%), occurred among the 1,476 patients with B-cell malignancies who received IMBRUVICA in clinical trials [see Adverse Reactions ( 6.1 )] . The most frequent second primary malignancy was non-melanoma skin cancer (6%).

5.7 Hepatotoxicity, Including Drug-Induced Liver Injury Hepatotoxicity, including severe, life-threatening, and potentially fatal cases of drug-induced liver injury (DILI), has occurred in patients treated with Bruton tyrosine kinase inhibitors, including IMBRUVICA. Evaluate bilirubin and transaminases at baseline and throughout treatment with IMBRUVICA. For patients who develop abnormal liver tests after IMBRUVICA, monitor more frequently for liver test abnormalities and clinical signs and symptoms of hepatic toxicity. If DILI is suspected, withhold IMBRUVICA. Upon confirmation of DILI, discontinue IMBRUVICA. 5. 8 Tumor Lysis Syndrome Tumor lysis syndrome has been infrequently reported with IMBRUVICA [see Adverse Reactions ( 6.2 )] . Assess the baseline risk (e.g., high tumor burden) and take appropriate precautions. Monitor patients closely and treat as appropriate. 5. 9 Embryo-Fetal Toxicity Based on findings in animals, IMBRUVICA can cause fetal harm when administered to a pregnant woman. Administration of ibrutinib to pregnant rats and rabbits during the period of organogenesis caused embryo-fetal toxicity including malformations at exposures that were 3-20 times higher than those reported in patients with hematologic malignancies. Advise pregnant women of the potential risk to a fetus. Advise females of reproductive potential to use effective contraception during treatment with IMBRUVICA and for 1 month after the last dose. [see Use in Specific Populations ( 8.1 )] .

The following clinically significant adverse reactions are described elsewhere in the labeling: Hemorrhage [see Warnings and Precautions ( 5.1 )] Infections [see Warnings and Precautions ( 5.2 )] Cardiac Arrhythmias, Cardiac Failure, and Sudden Death [see Warnings and Precautions ( 5.3 )] Hypertension [see Warnings and Precautions ( 5.4 )] Cytopenias [see Warnings and Precautions ( 5.5 )] Second Primary Malignancies [see Warnings and Precautions ( 5.6 )] Hepatotoxicity, including DILI [see Warning s and Precautions ( 5.7 )] Tumor Lysis Syndrome [see Warnings and Precautions ( 5.8 )] The most common (≥30%) adverse reactions in patients with B-cell malignancies are thrombocytopenia, diarrhea, fatigue, musculoskeletal pain, neutropenia, rash, anemia, bruising, and nausea ( 6 ). The most common (≥20%) adverse reactions in adult or pediatric patients with cGVHD are fatigue, anemia, bruising, diarrhea, thrombocytopenia, musculoskeletal pain, pyrexia, muscle spasms, stomatitis, hemorrhage, nausea, abdominal pain, pneumonia, and headache ( 6 ). To report SUSPECTED ADVERSE REACTIONS, contact AbbVie at 1-800-633-9110 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

6.1 Clinical Trials Experience Because clinical trials are conducted under widely variable conditions, adverse reaction rates observed in clinical trials of a drug cannot be directly compared with rates of clinical trials of another drug and may not reflect the rates observed in practice. Unless otherwise specified, the pooled safety population described in the WARNINGS AND PRECAUTIONS reflects exposure to IMBRUVICA in 6 trials. IMBRUVICA was administered as a single agent at 420 mg orally once daily (475 patients), as a single agent at 560 mg orally once daily [1.3 times the recommended adult dosage (174 patients)], and in combination with other drugs at 420 mg orally once daily (827 patients) in patients with B-cell malignancies. In this pooled safety population of 1,476 patients, 87% were exposed for 6 months or longer and 68% were exposed for greater than one year. The most common adverse reactions (≥ 30%) were thrombocytopenia, diarrhea, fatigue, musculoskeletal pain, neutropenia, rash, anemia, bruising, and nausea. Certain subsections in the WARNINGS AND PRECAUTIONS include patients who received IMBRUVICA in unapproved monotherapy or combination regimens. Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma The data described below reflect exposure to IMBRUVICA in one single-arm, open-label clinical trial (Study 1102) and five randomized controlled clinical trials (RESONATE, RESONATE-2, HELIOS, iLLUMINATE, and E1912) in patients with CLL/SLL (n=2,016 total, including n=1,133 patients exposed to IMBRUVICA). In general, patients with creatinine clearance (CLcr) ≤ 30 mL/min, AST or ALT ≥ 2.5 x ULN, or total bilirubin ≥ 1.5 x ULN (unless of non-hepatic origin) were excluded from these trials. In Study E1912, patients with AST or ALT > 3 x ULN or total bilirubin > 2.5 x ULN were excluded. Study 1102 included 51 patients with previously treated CLL/SLL. RESONATE included 386 randomized patients with previously treated CLL or SLL who received single agent IMBRUVICA or ofatumumab. RESONATE-2 included 267 randomized patients with treatment naïve CLL or SLL who were 65 years or older and received single agent IMBRUVICA or chlorambucil. HELIOS included 574 randomized patients with previously treated CLL or SLL who received IMBRUVICA in combination with BR or placebo in combination with BR. iLLUMINATE included 228 randomized patients with treatment naïve CLL/SLL who were 65 years or older or with coexisting medical conditions and received IMBRUVICA in combination with obinutuzumab or chlorambucil in combination with obinutuzumab. E1912 included 510 patients with previously untreated CLL/SLL who were 70 years or younger and received IMBRUVICA in combination with rituximab or received fludarabine, cyclophosphamide, and rituximab (FCR). The most common adverse reactions in patients with CLL/SLL receiving IMBRUVICA (≥ 30%) were thrombocytopenia, diarrhea, fatigue, musculoskeletal pain, neutropenia, rash, anemia, bruising, and nausea. Four to 10 percent of patients with CLL/SLL receiving IMBRUVICA discontinued treatment due to adverse reactions. These included pneumonia, hemorrhage, atrial fibrillation, neutropenia, arthralgia, rash, and thrombocytopenia. Adverse reactions leading to dose reduction occurred in approximately 9% of patients. Study 1102 Adverse reactions and laboratory abnormalities from Study 1102 (N=51) using single agent IMBRUVICA 420 mg daily in patients with previously treated CLL/SLL occurring at a rate of ≥ 10% with a median duration of treatment of 15.6 months are presented in Table 5 and Table 6 . Table 5: Non-Hematologic Adverse Reactions in ≥ 10% of Patients with CLL/SLL (N=51) in Study 1102 Body System Adverse Reaction All Grades (%) Grade 3 or Higher (%) Gastrointestinal disorders Diarrhea Constipation Nausea Stomatitis Vomiting Abdominal pain Dyspepsia 59 22 20 20 18 14 12 4 2 2 0 2 0 0 Skin and subcutaneous tissue disorders Bruising Rash Petechiae 51 25 16 2 0 0 Infections and infestations Upper respiratory tract infection Sinusitis Skin infection Pneumonia Urinary tract infection 47 22 16 12 12 2 6 6 10 2 General disorders and administration site conditions Fatigue Pyrexia Peripheral edema Asthenia Chills 33 24 22 14 12 6 2 0 6 0 Musculoskeletal and connective tissue disorders Musculoskeletal pain Arthralgia Muscle spasms 25 24 18 6 0 2 Respiratory, thoracic and mediastinal disorders Cough Oropharyngeal pain Dyspnea 22 14 12 0 0 0 Nervous system disorders Dizziness Headache 20 18 0 2 Vascular disorders Hypertension 16 8 Metabolism and nutrition disorders Decreased appetite 16 2 Neoplasms benign, malignant, unspecified Second malignancies 10 2 † † One patient death due to histiocytic sarcoma. Table 6: Treatment-Emergent* Hematologic Laboratory Abnormalities in Patients with CLL/SLL (N=51) in Study 1102 Percent of Patients (N=51) All Grades (%) Grade 3 or 4 (%) Platelets decreased 69 12 Neutrophils decreased 53 26 Hemoglobin decreased 43 0 * Based on laboratory measurements per IWCLL criteria and adverse reactions. Treatment-emergent Grade 4 thrombocytopenia (8%) and neutropenia (12%) occurred in patients. RESONATE Adverse reactions and laboratory abnormalities described below in Table 7 and Table 8 reflect exposure to IMBRUVICA with a median duration of 8.6 months and exposure to ofatumumab with a median of 5.3 months in RESONATE in patients with previously treated CLL/SLL. Table 7: Adverse Reactions Reported in ≥ 10% of Patients in the IMBRUVICA Treated Arm in Patients with CLL/SLL in RESONATE Body System Adverse Reaction IMBRUVICA (N=195) Ofatumumab (N=191) All Grades (%) Grade 3 or Higher (%) All Grades (%) Grade 3 or Higher (%) Gastrointestinal disorders Diarrhea 48 4 18 2 Nausea 26 2 18 0 Stomatitis* 17 1 6 1 Constipation 15 0 9 0 Vomiting 14 0 6 1 Musculoskeletal and connective tissue disorders Musculoskeletal pain* 28 2 18 1 Arthralgia 17 1 7 0 Muscle spasms 13 0 8 0 Skin and subcutaneous tissue disorders Rash* 24 3 13 0 Petechiae 14 0 1 0 Bruising* 12 0 1 0 General disorders and administration site conditions Pyrexia 24 2 15 2 † Respiratory, thoracic and mediastinal disorders Cough 19 0 23 1 Dyspnea 12 2 10 1 Infections and infestations Upper respiratory tract infection 16 1 11 2 † Pneumonia* 15 12 † 13 10 † Sinusitis* 11 1 6 0 Urinary tract infection 10 4 5 1 Nervous system disorders Headache 14 1 6 0 Dizziness 11 0 5 0 Injury, poisoning and procedural complications Contusion 11 0 3 0 Eye disorders Vision blurred 10 0 3 0 The body system and individual ADR terms are sorted in descending frequency order in the IMBRUVICA arm. * Includes multiple ADR terms. † Includes 3 events of pneumonia with fatal outcome in each arm, and 1 event of pyrexia and upper respiratory tract infection with a fatal outcome in the ofatumumab arm. 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CYP3A Inhibitors: Modify IMBRUVICA dose as described ( 2.3 , 7.1 ). CYP3A Inducers: Avoid coadministration with strong CYP3A inducers ( 7.2 ).

7.1 Effect of CYP3A Inhibitors on Ibrutinib The coadministration of IMBRUVICA with a strong or moderate CYP3A inhibitor may increase ibrutinib plasma concentrations [see Clinical Pharmacology ( 12.3 )] . Increased ibrutinib concentrations may increase the risk of drug-related toxicity. Dose modifications of IMBRUVICA are recommended when used concomitantly with posaconazole, voriconazole and moderate CYP3A inhibitors [see Dosage and Administration ( 2.3 )]. Avoid concomitant use of other strong CYP3A inhibitors. Interrupt IMBRUVICA if these inhibitors will be used short-term (such as anti-infectives for seven days or less) [see Dosage and Administration ( 2.3 ) ] . Avoid grapefruit and Seville oranges during IMBRUVICA treatment, as these contain strong or moderate inhibitors of CYP3A.

7.2 Effect of CYP3A Inducers on Ibrutinib The coadministration of IMBRUVICA with strong CYP3A inducers may decrease ibrutinib concentrations. Avoid coadministration with strong CYP3A inducers [see Clinical Pharmacology ( 12.3 ) ] .

Lactation : Advise not to breastfeed ( 8.2 ). Hepatic Impairment : Avoid use of IMBRUVICA in patients with severe hepatic impairment. In patients with mild or moderate impairment, reduce IMBRUVICA dose ( 2.4 , 8.6 ).

8.1 Pregnancy Risk Summary IMBRUVICA can cause fetal harm based on findings from animal studies. There are no available data on IMBRUVICA use in pregnant women to inform a drug-associated risk of major birth defects and miscarriage. In animal reproduction studies, administration of ibrutinib to pregnant rats and rabbits during the period of organogenesis at exposures up to 3-20 times the clinical dose of 420 mg daily produced embryofetal toxicity including structural abnormalities (see Data) . Advise pregnant women of the potential risk to a fetus. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2-4% and 15-20%, respectively. Data Animal Data Ibrutinib was administered orally to pregnant rats during the period of organogenesis at doses of 10, 40 and 80 mg/kg/day. Ibrutinib at a dose of 80 mg/kg/day was associated with visceral malformations (heart and major vessels) and increased resorptions and post-implantation loss. The dose of 80 mg/kg/day in rats is approximately 20 times the exposure in patients with CLL/SLL or WM administered a dose of 420 mg daily. Ibrutinib at doses of 40 mg/kg/day or greater was associated with decreased fetal weights. The dose of 40 mg/kg/day in rats is approximately 8 times the exposure (AUC) in patients administered a dose of 420 mg daily. Ibrutinib was also administered orally to pregnant rabbits during the period of organogenesis at doses of 5, 15, and 45 mg/kg/day. Ibrutinib at a dose of 15 mg/kg/day or greater was associated with skeletal variations (fused sternebrae) and ibrutinib at a dose of 45 mg/kg/day was associated with increased resorptions and post-implantation loss. The dose of 15 mg/kg/day in rabbits is approximately 2.8 times the exposure in patients with CLL/SLL or WM administered a dose of 420 mg daily.

8.2 Lactation Risk Summary There is no information regarding the presence of ibrutinib or its metabolites in human milk, the effects on the breastfed child, or the effects on milk production. Because of the potential for serious adverse reactions in the breastfed child, advise women not to breastfeed during treatment with IMBRUVICA and for 1 week after the last dose.

8.3 Females and Males of Reproductive Potential IMBRUVICA can cause fetal harm when administered to pregnant women [see Use in Specific Populations ( 8.1 )] . Pregnancy Testing Verify pregnancy status in females of reproductive potential prior to initiating IMBRUVICA. Contraception Females Advise females of reproductive potential to use effective contraception during treatment with IMBRUVICA and for 1 month after the last dose. Males Advise males with female partners of reproductive potential to use effective contraception during treatment with IMBRUVICA and for 1 month following the last dose.

8.4 Pediatric Use Chronic GVHD The safety and effectiveness of IMBRUVICA have been established for treatment of cGVHD after failure of one or more lines of systemic therapy in pediatric patients 1 year of age and older. Use of IMBRUVICA for this indication is supported by evidence from iMAGINE, a study which included pediatric patients age 1 year and older with previously treated cGVHD, including patients in the following age groups: one patient 1 year to less than 2 years of age, 20 patients 2 years to less than 12 years of age, and 19 patients 12 years to less than 17 years of age. Additional supportive efficacy data was provided from Study 1129 in adults [see Adverse Reactions ( 6.1 ), Clinical Pharmacology ( 12.3 ), and Clinical Studies ( 14.3 )] . The recommended dosage of IMBRUVICA in patients age 12 years and older is the same as that in adults, and the recommended dosage in patients age 1 year to less than 12 years old is based on body-surface area (BSA) [see Dosage and Administration ( 2.1 )] . The safety and effectiveness of IMBRUVICA have not been established for this indication in pediatric patients less than 1 year of age. Mature B-cell Non-Hodgkin Lymphoma The safety and effectiveness of IMBRUVICA in combination with chemoimmunotherapy were assessed but have not been established based on an open-label, randomized study (NCT02703272) in 35 patients, which included 26 pediatric patients age 5 to less than 17 years, with previously treated mature B-cell non-Hodgkin lymphoma. The study was stopped for futility. In the randomized population, major hemorrhage and discontinuation of chemoimmunotherapy due to adverse reactions occurred more frequently in the ibrutinib plus chemoimmunotherapy arm compared to the chemoimmunotherapy alone arm. CLL/SLL, CLL/SLL with 17p deletion, WM The safety and effectiveness of IMBRUVICA in pediatric patients have not been established in CLL/SLL, CLL/SLL with 17p deletion, or WM.

8.5 Geriatric Use Of 992 patients in clinical studies of IMBRUVICA for B-cell malignancies or cGVHD, 62% were ≥ 65 years of age, while 22% were ≥ 75 years of age [see Clinical Studies ( 14.1 , 14.2 , 14.3 )] . No overall differences in effectiveness were observed between younger and older patients. Anemia (all grades), pneumonia (Grade 3 or higher), thrombocytopenia, hypertension, and atrial fibrillation occurred more frequently among older patients treated with IMBRUVICA [see Adverse Reactions ( 6.1 )] .

8.6 Hepatic Impairment Adult Patients with B-cell Malignancies Avoid use of IMBRUVICA in patients with severe hepatic impairment (Child-Pugh class C). The safety of IMBRUVICA has not been evaluated in patients with mild to severe hepatic impairment by Child-Pugh criteria. Reduce the recommended dose when administering IMBRUVICA to patients with mild or moderate hepatic impairment (Child-Pugh class A and B). Monitor patients more frequently for adverse reactions of IMBRUVICA [see Dosage and Administration ( 2.4 ), Clinical Pharmacology ( 12.3 )]. Patients with cGVHD Avoid use of IMBRUVICA in patients with total bilirubin level > 3 x ULN (unless of non-hepatic origin or due to Gilbert’s syndrome). Reduce recommended dose when administering IMBRUVICA to patients with total bilirubin level > 1.5 to 3 x ULN (unless of non-hepatic origin or due to Gilbert’s syndrome) [see Dosage and Administration ( 2.4 )] .

8.7 Plasmapheresis Management of hyperviscosity in WM patients may include plasmapheresis before and during treatment with IMBRUVICA. Modifications to IMBRUVICA dosing are not required.

Ibrutinib is a small-molecule inhibitor of Bruton’s tyrosine kinase (BTK). Ibrutinib forms a covalent bond with a cysteine residue in the BTK active site, leading to inhibition of BTK enzymatic activity. BTK is a signaling molecule of the B-cell antigen receptor (BCR) and cytokine receptor pathways. BTK’s role in signaling through the B-cell surface receptors results in activation of pathways necessary for B-cell trafficking, chemotaxis, and adhesion. Nonclinical studies show that ibrutinib inhibits malignant B-cell proliferation and survival in vivo as well as cell migration and substrate adhesion in vitro .