A Phase I Trial Using Cyclophosphamide, Rituximab and Revlimid (CR2) for the Treatment of Relapsed/Refractory B-Cell Chronic Lymphocytic Leukemia (B-CLL) and Small Lymphocytic Lymphoma (SLL)

"COHORT 1: Cyclophosphamide 250 mg/m2 day 1, 2 and 3, Rituximab 500 mg/m2 i.v. day 1, Lenalidomide 2.5 mg/day starting day 8-28 of Cycle 1 and then daily on Days 1-28 of subsequent cycles~COHORT 2: Cyclophosphamide 250mg/m2 day 1, 2 and 3. Rituximab 500 mg.m2 i.v. daY Lenalidomide 5 mg/day starting day 8 -28 of Cycle 1 and then daily on Days 1-28 of subsequent cycles~COHORT 3: Cyclophosphamide 250mg/m2 day 1, 2 and 3, Rituximab 500 mg.m2 i.v. day 1, Lenalidomide 10 mg/day starting day 8 -28 of Cycle 1 and then daily on Days 1-28 of subsequent cycles~COHORT 4: Cyclophosphamide 250mg/m2 day 1, 2 and 3, Rituximab 500 mg.m2 i.v. day 1, Lenalidomide 15 mg/day starting day 8 -28 of Cycle 1 and then daily on Days 1-28 of subsequent cycles~Patients will receive a total of 6-8 cycles."