Ibrutinib With Rituximab and Lenalidomide for Patients With Recurrent/Refractory Primary or Secondary Central Nervous System Lymphoma (PCNSL/SCNSL)

Oral ibrutinib will be given between days 1 and 28 of each 28-day cycle and will be continued daily after completion of rituximab and lenalidomide. The starting dose of ibrutinib is 560 mg/day (dose level 1) and (dose level 2 ibrutinib: 840 mg daily).

Oral lenalidomide will be given between days 1 and 21 of each 28-day cycle for a maximum of 12 cycles. The starting dose of lenalidomide is 10 mg/day (dose level 1 \& 2) lenalidomide: 15 mg daily (dose level 3) and lenalidomide: 20 mg daily (dose level 4).

Intravenous rituximab (500mg/m2) will be given on day 1 of all cycles (+/- 3 days), for up to 6 cycles.