Effect of Serotonin Level on Constipation Caused by Chemotherapy in Patients With Ovarian, Fallopian Tube, or Primary Peritoneal Cancer

RATIONALE: Gathering information about changes in serotonin levels in patients undergoing chemotherapy for ovarian cancer, fallopian tube cancer, or primary peritoneal cancer may help doctors learn more about constipation caused by chemotherapy.
PURPOSE: This clinical trial is studying how blood levels of serotonin effect constipation caused by chemotherapy in patients with newly diagnosed ovarian cancer, fallopian tube cancer, or primary peritoneal cancer.