RAC1 and B-cell chronic lymphocytic leukemia: The use of lenalidomide, an immunomodulatory drug, can restore the normal activity levels of Rac1, RhoA, and Cdc42 in T cells of patients with chronic lymphocytic leukemia (CLL), and preserve the adhesion and movement ability of T cells and the function of integrin lymphocyte activation-related antigen 1 (LFA-1) (165).