Venetoclax With High-dose Ibrutinib for CLL Progressing on Single Agent Ibrutinib

On cycle 1, day 1, patients will initiate venetoclax. The dose of venetoclax will ramp-up from 20 mg PO daily to 400 mg PO daily over a 5 week period.

"During the screening period, patients will continue on ibrutinib at their previous tolerated dose, unless required to stop (e.g.: by a preceding clinical trial).~On cycle 1, day 1, the dose of ibrutinib will be assigned based on the dose cohort. Patients in cohort 1 will receive ibrutinib 420 mg PO daily. Patients in cohort 2 will receive ibrutinib 560 mg PO daily. Cohort 3 will be 840 mg PO daily."