We also demonstrated that 17f strongly reduces the growth of CML and AML cells with EC50 values below 10 μM close to EC50 values obtained with the STAT5 inhibitor pimozide (unpublished data) indicating that 17f as pimozide targets myeloid leukemia cells addicted to STAT5 signaling (see also Figure S1 for 17f and pimozide structures). The gene discussed is STAT5A; the disease is myeloid leukemia.