RecruitingPhase 2ProcedurePLX038 for Treatment of Metastatic Platinum-resistant Ovarian, Primary Peritoneal, and Fallopian Tube CancerThis phase II trial tests whether pegylated SN-38 conjugate PLX038 (PLX038) works to shrink tumors in patients with ovarian, primary peritoneal, and fallopian tube cancers that has spread from where it first started (primary site) to other places in the body (metastatic). PLX038 may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth.