[Progesterone antagonists: biochemical and pharmacological aspects and clinical usefulness].

Although classically the antiprogestins have been used for the control of pregnancy diseases and adrenal function, in the medical literature are a plenty of papers about the treatment with progesterone antagonists of leiomyoma, breast cancer, endometriosis and meningioma. The treatment is beneficial or mitigating in greatest number of cases, but they have other different uses than usual like contraception and abortion.