Obatoclax (GX15‐070) is a broad inhibitor of Bcl‐2 family proteins such as Bcl‐2, Bcl‐xL, Bcl‐w, and Mcl‐1,9 and is currently undergoing a phase I study for the treatment of patients with chronic lymphocytic leukemia (CLL).10 The gene discussed is MCL1; the disease is B-cell chronic lymphocytic leukemia.