The mechanism of action of lenalidomide is based on antitumor, antiangiogenic, proerythropoietic and immunomodulatory properties. Lenalidomide inhibits the proliferation of cells of some hematopoietic tumors, including plasma cell tumors of multiple myeloma (MM), follicular lymphoma tumors and cells with cytogenetic defects of chromosome 5. Lenalidomide enhances cellular immunity mediated by T cells and natural killer cells (NKs), increasing the number of NK T cells.