IL2 and leukemia: As shown in Table 1, the IC50 values of cis-3M-RES for unstimulated human peripheral T cells and IL-2-dependent proliferation of PHA-stimulated peripheral T cells were >10.0 and ∼0.23 μM, respectively, whereas those for malignant leukemia cells (Jurkat, U937, and HL-60), and HeLa cells were 0.07-0.08 and 0.17 μM, respectively.