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RAD51 Inhibitor B02 (B02) is an inhibitor of human RAD51 with an IC50 of 27.4 uM.

RAD51 Inhibitor B02 specifically inhibits human RAD51 (IC50=27.4 uM), but not its E. coli homologue RecA (IC50>250 uM)[1]. The combination of B02 with cisplatin has the strongest killing effect on the human breast cancer cells MDA-MB-231[2].

B02 significantly enhances the therapeutic effect of cisplatin on tumor cells in vivo. B02 is tolerated by mice at doses up to 50 mg/kg without obvious body weight loss. No inhibition of tumor growth is observed on mice solely treated by B02. Mice treated with 4 mg/kg cisplatin, however, shows a 33% inhibition of tumor growth. Finally, mice treated with 50 mg/kg B02 and 4 mg/kg cisplatin shows a 66% inhibition of tumor growth[2].

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