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The Taussig Cancer Center [R. v. S., J. C., D. M., R. G., T. B.], Departments of Gastroenterology [R. v. S., K. P.], Biostatistics and Epidemiology [P. E., L. R.], and Colorectal Surgery [J. C.], Cleveland Clinic Foundation, Cleveland, Ohio 44195; Colleges of Medicine and Public Health [G. S., K. C., B. D., L. K., B. H. K.] and Pharmacy [G. S., W. L. H., K. C.], The Ohio State University, Columbus, Ohio 43210; and National Cancer Institute, Bethesda, Maryland [E. H., G. K.]
Exisulind (sulindac sulfone; FGN-1), a metabolite of sulindac without known effects on prostaglandin synthesis, can promote apoptosis and inhibit tumorigenesis in preclinical systems. We performed a Phase I trial of this compound in patients with familial adenomatous polyposis (FAP) to examine the tolerability and safety of this drug in the cancer chemoprevention setting. Six patients each were treated with exisulind at doses of 200, 300, and 400 mg p.o. twice a day. Reversible hepatic dysfunction was noted in four of six patients treated at the 400-mg p.o., twice-a-day dose level, but in only one to two of six patients treated at each of the lower dose levels. The serum half-life of exisulind was 6–9 h; little drug accumulation was noted over time. A nonsignificant trend toward increased apoptosis in polyps was noted at the maximum tolerated dose, but no decrease in polyp numbers or significant effects on cellular proliferation was noted. After treatment, polyps tended to display a "halo" appearance grossly and mucinous differentiation histologically. The maximum safe dose of exisulind is 300 mg p.o. twice a day in patients with subtotal colectomies. Reversible hepatic dysfunction limits further dose escalation. A decrease in polyp numbers could not be demonstrated, but the trend toward increased apoptosis at the MTD and the observation of mucinous change histologically suggest that further investigation of drugs of this class might be warranted.
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