OUTLINE: This is a dose escalation study of gemcitabine. Patients receive intraperitoneal cisplatin on day 1 plus intraperitoneal gemcitabine on days 1, 8, and 15. No treatment will be given on day 22. Courses are repeated every 4 weeks. Patients receive up to 4 courses of therapy. Dose escalation of gemcitabine continues in cohorts of 3 patients until the maximum tolerated dose (MTD) is determined. The MTD is defined as the dose at which no more than 2 of 6 patients experience dose limiting toxicity (DLT). Patients are followed every 3 months for 2 years, then every 6 months thereafter.