Treat Malignant Ascites Caused by Gastrointestinal or Ovarian Cancer With M701 Bispecific Antibody

The phase II study is a controlled, open-label trial designed to assess the effectiveness and safety of M701 intra-peritoneal infusion for controlling malignant ascites in patients with gastrointestinal and ovarian cancer who are also receiving systemic therapy. A total of 80 patients with malignant ascites caused by gastrointestinal or ovarian cancer will be randomly assigned to two treatment arms in a 1:1 ratio. These patients must have experienced disease progression or intolerance after receiving at least two lines of systemic therapy. Both treatment arms will receive the systemic therapy, but the test arm will additionally receive M701 intra-peritoneal infusion, while the control arm will undergo paracentesis only. The primary endpoint of the study will be the puncture-free survival, which evaluates the efficacy of M701 in controlling malignant ascites. Secondary endpoints include the objective response rate (ORR) of malignant ascites, progression-free survival (PFS), overall survival (OS), quality of life (QOL), and safety profiles. The number of EpCAM-positive cells in the malignant ascites will be measured using flow cytometry before and after treatment with M701.