Cell Pathways Reports Extension Study Results Showing Ability Of FGN-1 To Prevent Formation Of Precancerous Colon Polyps

May 20, 1998

Investigational Drug Halts New Polyp Formation; Appears Well-Tolerated For Extended Use

HORSHAM, PA (May 20, 1998) -- Cell Pathways, Inc. today announced results from an open-label extension study of the company's lead investigational compound, FGN-1--(exisulind), in patients with Familial Adenomatous Polyposis (FAP; also known as Adenomatous Polyposis Coli, APC). Eighteen patients continuing on FGN-1 for as long as 18 months following the completion of a six month Phase I/II dose-ranging, safety and efficacy trial tolerated drug treatment well. The progressive increase in precancerous polyps that normally occurs in this patient population appeared to be arrested by the treatment. In addition, existing polyps in the FGN-1 treated patients appeared to decrease in size or remain stable over time.

The extension study results will be presented today at the American Gastroenterological Association meeting in New Orleans, Louisiana by clinical investigator, Rosalind van Stolk, M.D. of the Cleveland Clinic Foundation.

"FAP patients have historically experienced, on average, a significant increase in the number of precancerous polyps that develop in their rectum over a 12 month period," said Dr. van Stolk. "In contrast, we observed that new polyp formation halted in all patients receiving effective doses of FGN-1 for periods of 12 to 24 months, and in 16/18 patients, small polyps (6 mm or less) tended to regress in size while larger polyps remained stable."

"We are very encouraged by these results, which show a strong trend that supports FGN-1's ability to prevent the normal progression of disease in patients with FAP," said Rifat Pamukcu, M.D., chief scientific officer and senior vice president of research and development at Cell Pathways. "Left untreated, FAP patients invariably develop colon cancer." He noted that a randomized, placebo-controlled Phase III trial of FGN-1 in FAP patients was ongoing and expected to conclude in early 1999.

FAP and Colon Cancer

Colonic adenomatous polyps are known to precede the formation of colorectal cancers. Individuals with FAP, an inherited condition, form hundreds to thousands of polyps in the colon and rectum, and face the inevitable development of colon cancer from these polyps if the colon is not removed. After removal of the colon, FAP patients are closely monitored throughout their lifetimes to detect and surgically remove most precancerous polyps and any cancerous lesions that may develop in the gastrointestinal tract. Approximately 25,000 - 50,000 individuals in the United States suffer from FAP, with a similar incidence of the disease in Europe and Japan. Precancerous colon polyps, histologically and genetically indistinguishable from the polyps of FAP, also occur "sporadically," but repeatedly, in more than 30% of people in the United States over the age of 50, putting these individuals at significantly increased risk of colon cancer.

Extension Study Design

All patients completing at least six-months in an open-label Phase I/II trial of FGN-1 at oral doses ranging from 400 to 800 mg/day participated in the extension study. In that follow-on study, patients initially received a total of either 600 mg or 800 mg/day FGN-1, with the 800 mg/day group subsequently reduced to 600 mg/day when investigators determined that dosage to be the maximum tolerated. Investigators recorded the serial polyp counts and the percent of flattened or haloed lesions in the patient's rectums at 6 months, 9 months, 12 months, 18 months and 24 months.

FGN-1 (Exisulind)

Cell Pathways is developing FGN-1 (exisulind) as an agent for the prevention of cancer. The orally active drug acts through a unique mechanism to induce selective apoptosis, or programmed cell death, in precancerous and cancerous cells without affecting normal cells.

Cell Pathways Inc. has begun or plans to initiate clinical trials of FGN-1 in 1998 in seven clinical indications. The company is conducting an ongoing pivotal Phase III trial for the treatment of FAP (APC). In December 1997, the company initiated Phase II/III trials of FGN-1 for the treatment of sporadic adenomatous colonic polyps and for the prevention of prostate cancer recurrence. A pilot study of FGN-1 for the treatment of lung cancer also began at that time. In addition, the company initiated a Phase II/III trial of FGN-1 for the prevention of breast cancer recurrence in February 1998. CPI also plans to begin two additional Phase II trials in precancerous indications in 1998.

Cell Pathways, Inc. is a pharmaceutical company focused on the development and commercialization of products to prevent and treat cancer.

Kureczka/Martin Associates

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