Study Examining the Combination of Revlimid (Lenalidomide)and Vidaza (Azacitidine) for Relapsed/Refractory CLL and SLL

Lenalidomide PO daily Day 1-21. For patients with baseline calculated creatinine clearance ≥ 30 ml/min and \< 60 ml/min the starting dose is 5 mg every other day (odd numbered days during Days 1-21). For patients with baseline calculated creatinine clearance ≥ 60 ml/min the starting dose is 5 mg daily on Days 1-21).

Azacitidine 75 mg/m2 IV or SC D 1-5