Lenalidomide and Cytarabine in Treating Patients With Relapsed or Refractory Acute Myeloid Leukemia

This phase I trial is studying the side effects and best dose of lenalidomide when given together with cytarabine in treating patients with relapsed or refractory acute myeloid leukemia (AML). Biological therapies, such as lenalidomide, may stimulate the immune system in different ways and stop cancer cells from growing. Drugs used in chemotherapy, such as cytarabine, work in different ways to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. Giving lenalidomide together with cytarabine may kill more cancer cells