Liposome-Encapsulated Doxorubicin Citrate With or Without Gemcitabine Hydrochloride in Treating Patients With Ovarian Epithelial Cancer, Fallopian Tube Cancer, or Primary Peritoneal Cavity Cancer

RATIONALE: Drugs used in chemotherapy, such as liposome-encapsulated doxorubicin citrate and gemcitabine hydrochloride, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. It is not yet known whether liposome-encapsulated doxorubicin citrate is more effective when given together with or without gemcitabine hydrochloride in killing tumor cells. PURPOSE: This randomized phase II trial is studying liposome-encapsulated doxorubicin citrate given together with gemcitabine hydrochloride to see how well it works compared with liposome-encapsulated doxorubicin citrate alone in treating patients with ovarian epithelial cancer, fallopian tube cancer, or primary peritoneal cavity cancer.