Activity & Safety Study of Lenalidomide & Rituximab as Non-chemotherapy Based Therapy on Chronic Lymphocytic Leukemia

"Lenalidomide: Oral use. It will be administered from day 1 to 21 of 28 days cycles in a total of 6 cycles.~Rituximab, intravenous use. The dose will be administered at the standard (375 mg/m2 in the first cycle and 500 mg/m2 in successive cycles).~In the first cycle Rituximab will be administered in two divided doses:100mg/m2 total on day 1 and the rest up to 375mg/m2 on day 2.~If lenalidomide treatment starts on day 1, Rituximab will be administered, in this first cycle, on days -2 (100 mg/m2) and -1 (275 mg/m2).~In the second and subsequent cycles, 500 mg/m2 of Rituximab will be administered on day -1."