Objective: To investigate the relationship between the pathogenesis and the levels of Interfron-r and Interleukin-4 secreted by T helper (Th) cells in peritoneal fluid in endometriosis. Methods: Twenty-four women with pathological diagnosed endometriosis after operation were selected as endometriosis group and 24 with leiomyoma or benign ovarian tumor were selected as control group. Th cells in peritoneal fluid were isolated and cultured, the levels of IFN-r and IL-4 in culture media were determined by enzy...