A Study of the Bruton's Tyrosine Kinase Inhibitor, PCI-32765 (Ibrutinib), in Combination With Rituximab, Cyclophosphamide, Doxorubicin, Vincristine, and Prednisone in Patients With Newly Diagnosed Non-Germinal Center B-Cell Subtype of Diffuse Large B-Cell Lymphoma

The purpose of this study is to evaluate if ibrutinib administered in combination with rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone (R-CHOP) improves the clinical outcome in newly diagnosed patients with non-germinal center B-cell subtype (GCB) of diffuse large B-cell lymphoma (DLBCL) selected by immunohistochemistry (IHC) or newly diagnosed patients with activated B cell-like (ABC) subtype of DLBCL identified by gene expression profiling (GEP) or both populations.

This is a randomized (individuals assigned to study treatment by chance), double-blind (individuals and study personnel will not know the identity of study treatments), placebo (an inactive substance that is compared with a drug to test whether the drug has a real effect in a clinical trial)-controlled study to compare the efficacy and safety of ibrutinib in combination with R-CHOP versus R-CHOP alone in adult patients newly diagnosed non-GCB DLBCL selected by IHC or newly diagnosed patients with ABC subtype of DLBCL identified by GEP or both populations. The study will include screening, active treatment, and posttreatment follow-up phases. The study will end when 50% of participants have died or 5 years after the last participant is randomized or the sponsor terminates the study, whichever occurs first. Approximately 800 participants will be randomly assigned in a 1:1 ratio to receive either placebo+R-CHOP (treatment arm A) or ibrutinib+R-CHOP (treatment arm B). All participants will receive R-CHOP as background therapy for 6 or 8 cycles (21 days per cycle) prespecified according to local practice. After 4 treatment cycles, an interim response assessment will be performed to evaluate disease progression for each participant. Participants with progressive disease or relapsed disease after complete response will be discontinued from treatment. Participants who discontinue R-CHOP without disease progression will continue study drug (placebo or ibrutinib) until 6 or 8 cycles are completed, disease progression, or unacceptable toxicity, whichever occurs first. After completion of study drug, participants will undergo assessment of tumor response based on the Revised Response Criteria for Malignant Lymphoma. Participants with documented residual disease upon completion of at least 6 cycles of R-CHOP therapy are considered eligible to initiate subsequent antilymphoma therapy. Serial pharmacokinetic samples will be collected before and after dosing, and safety will be monitored throughout the study.

Eligibility Criteria:
Inclusion Criteria:

* No prior treatment for diffuse B-cell lymphoma (DLBCL)
* Histologically-confirmed non-germinal center B-cell subtype DLBCL
* Stage II (not candidates for local x-ray therapy), III, or IV disease by the Ann Arbor Classification
* At least 1 measurable site of disease according to Revised Response Criteria for Malignant Lymphoma
* Revised International Prognostic Index score of \>=1
* Eastern Cooperative Oncology Group performance status grade of 0, 1, or 2
* Hematology and biochemical laboratory values within protocol-defined parameters prior to random assignment and at baseline
* Left ventricular ejection fraction within institutional normal limits, as determined by echocardiography or multiple uptake gated acquisition (MUGA) scan
* Agrees to protocol-defined use of effective contraception (for women, these restrictions apply for 12 months after the last dose of rituximab or 1 month after the last dose of study drug, whichever is later; for men, these restrictions apply for 12 months after the last dose of rituximab or 3 months after the last dose of study drug, whichever is later)
* Men must agree to not donate sperm during and after the study for 12 months after the last dose of rituximab or 3 months after the last dose of study drug, whichever is later
* Women of childbearing potential must have a negative serum or urine pregnancy test at screening

Exclusion Criteria:

* Major surgery within 4 weeks of random assignment
* Known central nervous system or primary mediastinal lymphoma
* Prior history of indolent lymphoma
* Diagnosed or treated for malignancy other than DLBCL, except: malignancy treated with curative intent and with no known active disease present for \>=3 years before random assignment; adequately treated non-melanoma skin cancer or lentigo maligna without evidence of disease; adequately treated carcinoma in situ without evidence of disease
* History of stroke or intracranial hemorrhage within 6 months prior to random assignment
* Requires anticoagulation with warfarin or equivalent vitamin K antagonists
* Requires treatment with strong CYP3A inhibitors
* Prior anthracycline use \>=150 mg/m2
* Clinically significant cardiovascular disease such as uncontrolled or symptomatic arrhythmias, congestive heart failure, or myocardial infarction within 6 months of screening, or any Class 3 (moderate) or Class 4 (severe) cardiac disease as defined by the New York Heart Association Functional Classification
* Known history of human immunodeficiency virus or active hepatitis C virus or active hepatitis B virus infection or any uncontrolled active systemic infection requiring intravenous antibiotics
* Women who are pregnant or breastfeeding
* Any life-threatening illness, medical condition, or organ system dysfunction which, in the investigator's opinion, could compromise the patient's safety, interfere with the absorption or metabolism of ibrutinib capsules, or put the study outcomes at undue risk