Venetoclax, Lenalidomide and Rituximab in Patients With Previously Untreated Mantle Cell Lymphoma

PO days 8 - 28 cycles during cycle 1 only. Starting with ramp-up dose as follows (50 mg x 7 days then 100mg x 7 days then 200 mg x 7 days then 400 mg for remainder of therapy). Will be given days 1-28 at a dose of 400 mg cycle 2-12.

10 mg day 1-7 of and 15 mg day 8-14 cycle #1. 20 mg PO day day 15-21 of cycle #1 and days 1-21 cycles 2-12.

375 mg/m2 IV day 1, 8, 15, 22 of 1st cycle then on day 1 for cycles 2, 4, 6, 8, 10, 12