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This is an open-label, non-randomized, single center, dose escalation, phase I/II study to establish the maximum-tolerated dose (MTD) of ibrutinib as a single agent in patients with refractory/recurrent PCNSL or refractory/recurrent SCNSL (Arm A).

The defined MTD from Arm A will then be used in an expansion cohort to further assess toxicity and clinical activity

Arm C will investigate the MTD of ibrutinib in combination with HD-MTX and to determine the safety and tolerability of the ibrutinib/HD-MTX combination regimen in PCNSL and SCNSL patients. To minimize drug-drug interaction between HD-MTX and Ibrutinib, Ibrutinib will not be administered concurrently with HD-MTX.

THIS IS ONLY ARM RECRUITING In Arm D, patients will be treated with 4 cycles of therapy. Methotrexate (3.5 g/m2) will be given at Dday 1 and Dday 15 of each cycle. Rituximab (500 mg/m2) will be given at Dday 0 and Dday 15 of each cycle. Vincristine (1.4mg/m2) will be given at Dday 1 and 15 of cycle 1 and 2 only. Procarbazine (100mg/m2) will be given of Day 1 of each cycle. Ibrutinib will be dosed at 560 mg daily. Arm D will have a safety lead-in of 6 patients. If more than 1 of 6 subjects develop a dose limiting toxicity (DLT) within the first 28 days of therapy (cycle 1), ibrutinib will be reduced to 420 mg daily dosing, and 6 additional patients will be enrolled. If more than 1 of 6 subjects develop a DLT, additional enrollment will be stopped.

Arm A: Ibrutinib will be given once daily. The starting dose cohort (level 1) will receive 560 mg/day (4 x 140 mg capsules). During the dose escalation period of the study, the "3+3" design will be applied (see Table 3). Participants will be assigned to cohorts of increasing oral daily doses of ibrutinib (560mg, 840mg) until disease progression, intolerable toxicity or death. Three patients with recurrent/refractory PCNSL or recurrent/refractory SCNSL will be treated with daily oral ibrutinib for a 28-day cycle starting at dose level 1 and observed for toxicities during cycle 1. Arm B: Ibrutinib will be given at the MTD defined in Arm A.

Arm C1: HD-MTX at 3.5g/m2 (standard hydration/leucovorin support) will be given on day 1 and 15 of each 28-day cycle for a total of 4 cycles totaling 8 HD-MTX administrations. Ibrutinib will be given between days 5 and 14 as well as days 19 and 28 of each cycle and continued daily after completion of HD-MTX treatments.The starting dose of ibrutinib is 560 mg/day (4x140mg capsules)

HD- Methotrexate (MTX)

Arm C2: Intravenous rituximab (500mg/m2) will be given on day 0, 14, and 28 of cycle 1 and day 14 and 28 of all following cycles. HD-MTX at 3.5g/m2 (standard hydration/leucovorin support) will be given on day 1 and 15 of each 28-day cycle for a maximum of 4 cycles totaling 8 HD-MTX administrations. Ibrutinib will be given between days 5 and 14 as well as days 19 and 28 of each cycle and continued daily after completion of HD-MTX treatments. The starting dose of ibrutinib is 560 mg/day (4x140mg capsules; dose level 1) (see Table 4). Filgrastim will be given at days 7-11 and 22-26.

Rituximab + HD- Methotrexate (MTX)

Arm D: THIS IS THE ONLY ARM RECRUITING: : Oral procarbazine (100mg/m2/day) will be given on Day 1 through 7 during each cycle. Patients will be maintained on a tyramine-free diet during procarbazine administration.

procarbazine

Christian Grommes, MD

Ingo Mellinghoff, MD

The purpose of this study is to test any good or bad effects of the study drug called of ibrutinib (also known as Imbruvica™). At this stage of this trial, the study is investigating whether Ibrutinib can be incorporated into the established first-line chemotherapy regimen rituximab, methotrexate, vincristine, and procarbazine (R-VMP) in order to further refine the first-line induction therapy for PCNSL, as observed by a superior CRR (complete response rate) (ARM D RECRUITING ONLY)

Bruton's Tyrosine Kinase (BTK) Inhibitor, Ibrutinib, in Patients With Newly Diagnosed or Refractory/Recurrent Primary Central Nervous System Lymphoma (PCNSL) and Refractory/Recurrent Secondary Central Nervous System Lymphoma (SCNSL)

A Phase I/II Trial of the Bruton's Tyrosine Kinase (BTK) Inhibitor, Ibrutinib, in Patients With Newly Diagnosed or Refractory/Recurrent Primary Central Nervous System Lymphoma (PCNSL) and Refractory/Recurrent Secondary Central Nervous System Lymphoma (SCNSL)

A standard 3+3 design will be employed. Three dose levels of ibrutinib will be investigated. Patients will be treated in cohorts of size three to six and the dosage will be escalated if the clinical toxicity is acceptable. A dose-limiting toxicity (DLT) is defined as in any of the following during cycle 1: any grade 4 hematologic toxicity, grade 3 febrile neutropenia and grade 3 thrombocytopenia associated with bleeding or any grade 3 non-hematologic toxicity that does not respond to supportive therapy and at least possibly related to treatment with ibrutinib.

Progression-free survival (PFS) is defined as the time from the date of treatment start to the date of the first documented PD or death due to any cause.

Three patients with PCNSL or SCNSL will be treated with daily oral ibrutinib +/- HD-MTX for a 28-day cycle starting at dose level 1 and observed for toxicities for a minimum of 4 weeks. Dose-limiting toxicity (DLT) will be defined as any grade 4 hematologic toxicity, grade 3 febrile neutropenia and grade 3 thrombocytopenia associated with bleeding as well as any grade 3 non-hematologic toxicity that does not respond to supportive therapy and at least possibly related to ibrutinib. If no DLT is observed in any of the 3 treated patients, we will escalate to the next dose level.

in patients by assessing the frequency and severity of adverse events.

1. The severity grade (CTCAE Grade 1-4)
2. Its duration (Start and end dates)
3. Its relationship to the study treatment (Reasonable possibility that AE is related: No, Yes)
4. Action taken with respect to study or investigational treatment (none, dose adjusted, temporarily interrupted, permanently discontinued, unknown, ongoing, not applicable)

Duration of response is defined as the time from the date of first occurrence of CR or PR to the date of the first documented PD or death due to any cause.Duration of response will be described using Kaplan-Meier curves with appropriate summary statistics

Pharmacyclics LLC.

Janssen Biotech, Inc.

Memorial Sloan Kettering Cancer Center

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