Pemetrexed Disodium in Treating Patients With Ovarian Epithelial Cancer or Primary Peritoneal Cancer

OBJECTIVES: * Determine the antitumor activity of pemetrexed disodium in patients with recurrent or persistent platinum-resistant ovarian epithelial or primary peritoneal cancer that failed higher priority treatment protocols. * Determine the nature and degree of toxicity of this drug in these patients. OUTLINE: This is a multicenter study. Patients receive pemetrexed disodium IV over 10 minutes on day 1. Courses repeat every 21 days in the absence of disease progression or unacceptable toxicity. Beginning 7 days before and continuing until 3 weeks after the last dose of pemetrexed disodium, patients also receive oral folic acid daily and cyanocobalamin (vitamin B\_12) intramuscularly every 9 weeks. Patients are followed every 3 months for 2 years and then every 6 months for 3 years. PROJECTED ACCRUAL: A total of 19-51 patients will be accrued for this study within 11-22 months.