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A Phase I Study of Oral BMS-275291, a Novel Nonhydroxamate Sheddase-Sparing Matrix Metalloproteinase Inhibitor, in Patients with Advanced or Metastatic Cancer

¹ Developmental Therapeutics Program, Lombardi Cancer Center, Georgetown University Medical Center, Washington, DC; ² Duke University Medical Center, Durham, North Carolina; and ³ Bristol-Myers Squibb Pharmaceutical Research Institute, Wallingford, Connecticut

Purpose: BMS-275291 is a novel broad-spectrum inhibitor of matrix metalloproteinase (MMPs) rationally designed to spare a class of closely related metalloproteinases known as sheddases. Inadvertent sheddase inhibition is hypothesized to play a role in the dose-limiting joint toxicities occurring with hydroxamate-based MMP inhibitors. This trial was conducted to establish the recommended phase II dose; determine safety, toxicity, and pharmacokinetics of BMS-275291; and to assess potential markers of sheddase activity [tumor necrosis factor- (TNF) release and TNF-RII shedding].

Experimental Design: This was an open label, single arm, phase I study conducted at two centers. Patients with advanced or metastatic cancer were treated with once-daily oral BMS-275291 at doses escalating from 600 to 2400 mg/day. Six to eight patients/dose level were to be studied with the recommended phase II dose level expanded to a total of 15 patients. Pharmacokinetic sampling was performed on days 1, 15, and 29 at 0, 0.5, 1, 2, 4, 6, 8, and 24 h after dosing. Radiological tumor assessment was performed every 8 weeks.

Results: Forty-four evaluable patients were enrolled in this study with the most frequent tumor types being colorectal cancer and non-small cell lung cancer. Dose limiting toxicities were observed at 600 mg/day (one of eight patients with grade 3 transaminitis) and at 1200 mg/day (1 of 15 patients with grade 3 rash and grade 4 shortness of breath), both in the context of predisposing conditions. No dose-limiting toxicities occurred at 900, 1800, or 2400 mg/day. The most frequent adverse events considered possibly, probably, or definitely drug-related were joint toxicity (myalgia/arthralgia), rash, fatigue, headache, nausea, and taste change, all of which were mild, grade 1, grade 2, and not dose-limiting. No objective tumor responses were observed. Twelve of forty-four patients received treatment for 4+ months, six for 8+ months, three for >1 year. Desired trough levels of parent BMS-275291 were maintained with once daily dosing. The mean plasma concentration of parent BMS-275291 at trough exceeded the calculated in vitro IC₈₀ value for MMP-2 and IC₉₀ value for MMP-9 at the recommended phase II dose of 1200 mg/day. No major changes in serum concentrations of sheddase enzymatic products, TNF or TNF-RII, were observed.

Conclusions: BMS-275291 is a nonhydroxamate MMP inhibitor with a novel mercaptoacyl zinc-binding group. In this study, plasma concentrations of BMS-275291 continuously exceeded in vitro MMP IC₅₀ values without dose-limiting joint toxicity. In this refractory patient population, a suggestion of disease stabilization was observed in 12 patients. On the basis of preclinical, clinical, and pharmacokinetic data, the recommended phase II dose for future study is 1200 mg/day.

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