Ibrutinib Combination Therapy in Transplant Ineligible Individuals With Newly Diagnosed Primary CNS Lymphoma

Inclusion Criteria:

• Patients must have histological or cytological evidence of primary central nervoussystem (CNS) lymphoma (PCNSL); patients with vitreo-retinal lymphoma (NHL) orcerebrospinal fluid (CSF) positive disease are eligible providing there is CNSinvolvement on MRI compatible with PCNSL

• Patients must be 18 years of age or older

• Patients must be ineligible (≥65 years old or comorbidities) for high-dosechemotherapy and autologous stem cell transplantation. Patients must be consideredfit, as determined by the treating physician, to receive high dose methotrexate,ibrutinib and rituximab as per protocol

• Patients must have consented to the release of a tumour block from their braintumour, if available (see Section 12.0). The centre/pathologist must have agreed tothe submission of the specimen(s).

• No prior systemic therapy other than corticosteroids for PCNSL is permitted. Use ofcorticosteroids to control symptoms of PCNSL is allowed, but the patient must be ona maximum dose of dexamethasone 8mg/day (or equivalent) or less at the time ofenrolment. Patients must wean off the steroids within 7 days of starting the studyprotocol treatment

• Previous major surgery is permitted provided that surgery occurred at least 28 daysprior to patient enrollment and that wound healing has occurred. The 28 day cut-offdoes not apply to surgery for PCNSL; treatment may begin following brain biopsy whendeemed safe by the treating investigator

• No prior radiation therapy for PCNSL is allowed

• ECOG performance status 0-2, and ECOG 3 permitted if secondary to primary CNSlymphoma and expected to reverse with treatment

• Patients must be able to swallow oral medications and have no known gastrointestinaldisorders that may interfere with absorption (such as malabsorption).

• Patients must have adequate organ and marrow function measured within 7 days priorto enrollment including: Absolute neutrophils ≥ 1.0 x 10^9/L (independent of growthfactor support); Platelets ≥ 75 x 10^9/L; Bilirubin ≤ 1.5 x UNL; ALT ≤ 3.0 x UNL (ifAST >3 x UNL consult with CTG re: eligibility); Creatinine clearance ≥ 50 mL/min

• Patient is able (i.e. sufficiently fluent) and willing to complete the quality oflife questionnaire in either English or French

• Patients must be accessible for treatment and follow up. Patients enrolled on thistrial must be treated and followed at the participating centre

• In accordance with CCTG policy, protocol treatment is to begin within 2 working daysof patient enrollment

• Women/men of childbearing potential must have agreed to use a highly effectivecontraceptive method.

Exclusion Criteria:

• Patients with secondary central nervous system non-Hodgkin lymphoma (NHL).

• Patients with significant third space accumulation (pleural effusions, ascites)which cannot be adequately drained in advance of methotrexate administration

• Patients with a prior or concurrent malignancy whose natural history or treatmentdoes not have the potential to interfere with the safety or efficacy assessment ofthe investigational regimen are eligible for this trial. However, patients on activeanticancer therapy for other advanced or metastatic malignancies are not eligible.

• Patients with a known hypersensitivity to the study drugs or their components

• Active, uncontrolled bacterial, fungal, or viral infection within 7 days prior toenrollment. Patients with hepatitis B serology suggestive of past infection areeligible if they are HBV DNA negative and concurrently treated with anti-viraltherapy. Patients with a history of hepatitis C which has been treated and is nolonger active are eligible. Patients with known human immunodeficiency virus (HIV)with CD4 count < 350 cells/microliter are ineligible. Patients who are HIV positiveare eligible, provided:

• They have received antiretroviral therapy for at least 4 weeks prior toenrollment, and the anti-viral drugs used are not known to have clinicallyrelevant drug-drug interactions with ibrutinib AND

• HIV viral load must be < 400 copies/ml within 16 weeks prior to enrollment ANDNo history of opportunistic infections within the past year

• Serious illnesses or medical conditions which would not permit the patient to bemanaged according to protocol

• Patients may not receive concurrent treatment with other anti-cancer therapy orinvestigational agents while on protocol therapy

• Patients with prior allogenic bone marrow transplant or double umbilical cord bloodtransplantation.

• Pregnant or breastfeeding women

• Patients requiring:

1. Anticoagulation with warfarin or equivalent vitamin K antagonists

2. Continued requirement for therapy with a strong CYP3A inhibitor or inducer (seetrial webpage for list)

3. Corticosteroid treatment with > 8mg of dexamethasone (or equivalent) at thetime of enrollment

4. Supplements containing fish oil or vitamin E, and grapefruit juice should beavoided

• Live attenuated vaccination administered within 30 days prior to enrollment

• Patients with clinically significant cardiac disease, including:

• angina pectoris, symptomatic pericarditis, coronary artery bypass grafting,coronary angioplasty, or stenting, or myocardial infarction in the previous 12months;

• history of documented congestive heart failure (New York Heart Associationfunctional classification III-IV) or cardiomyopathy;

• uncontrolled hypertension (per Canadian guidelines);

• atrial or ventricular arrhythmias; patients with controlled atrial fibrillationare eligible

• Patients with distant clinically significant cardiac history should have a LVEF ≥ 50%