Thirty-two infertile women with laparoscopic diagnosis of asymptomatic pelvic endometriosis were treated with gestrinone 2.5 mg twice weekly for 6 months. Subsequently, a second-look laparoscopy was performed in all of them. All of the patients were followed for at least 12 months after the end of treatment, during which time they attempted to conceive. Ten (31.25%) from all 32 treated women became pregnant. The highest incidence of pregnancy was in the stage I (12.5%) and II (12.5%) (rAFS) of endometriosis, a half of them in stage III (6.25%) and no pregnancy was recorded in the stage IV found prior to the beginning of therapy. There was no statistically significant (chi 2-test) relationship between the reduction of laparoscopic findings (defined as a visual extermination or as a decrease in staging of endometriosis) and pregnancy. In 19 (59.4%) from 32 treated women the stage of endometriosis remained unchanged, in 9 (28.3%) it was reduced by one up to three stages and in 4 (12.5%) the endometriosis was visually eliminated. In no case the staging of endometriosis was worsened during therapy. Gestrinone was well tolerated. In no one of patients it was necessary to interrupt the treatment untimely.

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