The first evidence for the cancer therapeutic potential of A2-32-01 was illustrated by its cytoxicity in leukemic cell lines such as OCI-AML2, TEX, and K562, although it had no effect onthe acute promyelocytic leukemic HL-6028 (Table 1). Notably,the level of HsClpP expression is highly elevated in OCIAML2,TEX, and K562 in comparison to the level in HL-60.28 In addition, A2-32-01 is also cytotoxic in the 143B osteosarcoma cell line but not for the mitochondrion-depleted 143B Rho (0) cells28 (Table 1). Together, the cytotoxicity of A2-32-01 has been implicated to manifest in the mitochondria and is likely dependent on high levels of HsClpP expression.