NCT02048813 2026-05-29Ibrutinib and Rituximab Compared With Fludarabine Phosphate, Cyclophosphamide, and Rituximab in Treating Patients With Untreated Chronic Lymphocytic Leukemia or Small Lymphocytic LymphomaNational Cancer Institute (NCI)Phase 3 Active not recruiting529 enrolled 12 charts 1 FDA