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Preclinical Antitumor Activity of BMS-214662, a Highly Apoptotic and Novel Farnesyltransferase Inhibitor

Pharmaceutical Research Institute, Oncology Drug Discovery, Bristol-Myers Squibb Company, Inc., Princeton, New Jersey 08543

BMS-214662 is a potent and selective inhibitor of farnesyltransferase (FTI). In rodent fibroblasts transformed by oncogenes, BMS-214662 reversed the H-Ras-transformed phenotype but not that of K-Ras or other oncogenes. In soft agar growth assays, BMS-214662 showed good potency in inhibiting H-ras-transformed rodent cells, A2780 human ovarian carcinoma tumor cells, and HCT-116 human colon carcinoma tumor cells. Inhibition of H-Ras processing in HCT-116 human colon tumor cells was more rapid than in H-Ras-transformed rodent fibroblast tumors. BMS-214662 is the most potent apoptotic FTI known and demonstrated broad spectrum yet robust cell-selective cytotoxic activity against a panel of cell lines with diverse histology. The presence of a mutant ras oncogene was not a prerequisite for sensitivity. Athymic and conventional mice were implanted s.c. with different histological types of human and murine tumors, respectively. BMS-214662 was administered both parenterally and p.o. and was active by all these routes. Curative responses were observed in mice bearing staged human tumor xenografts including HCT-116 and HT-29 colon, MiaPaCa pancreatic, Calu-1 lung, and EJ-1 bladder carcinomas. A subline of HCT-116, HCT-116/VM46, resistant to many standard cytotoxic agents by means of a multiple drug resistance mechanism, remained quite susceptible to BMS-214662, and borderline activity was achieved against N-87 human gastric carcinoma. Two murine tumors, Lewis lung carcinoma and M5076 sarcoma, were insensitive to the FTI. In a study performed using Calu-1 tumor-bearing mice, no obvious schedule dependency of BMS-214662 was observed. The FTI, BMS-214662, demonstrated broad spectrum activity against human tumors, but murine tumors were not as sensitive.

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