OBJECTIVES: I. Evaluate the antitumor effect of weekly cisplatin and irinotecan in patients with suboptimally debulked ovarian, fallopian tube, or peritoneal cancer and persistently elevated serum values of CA125 after 3 courses of standard therapy with paclitaxel and either carboplatin or cisplatin. II. Evaluate the toxicity, both qualitative and quantitative, of this regimen in this patient population. III. Evaluate the quality of life of these patients.