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Inhibition of the antiapoptotic BCL2 family is one of the most promising areas of anticancer drug development. However, ABT-737, a specific BCL2 inhibitor, is neither orally bioavailable nor metabolically stable. To overcome these problems, the structurally related molecule ABT-263 was synthesized and recently entered clinical trials in hematologic malignancies, including chronic lymphocytic leukemia (CLL). Almost all laboratory studies have been carried out with ABT-737 rather than ABT-263, the drug being used in clinical trials. Currently there are no published data on the comparative effects of these inhibitors. To gain insight into the potential value or limitations of ABT-263 in the clinic, we assessed its ability to induce apoptosis in clinically relevant cellular models of CLL.

Diminished Sensitivity of Chronic Lymphocytic Leukemia Cells to ABT-737 and ABT-263 Due to Albumin Binding in Blood