[Association of breast cancer and cancer of the uterus. 34 case reports].

A retrospective series of 34 cases of breast cancer combined with uterine cancer is reported. Cancers of the endometrium differed from cervical cancers by their number, 2.2 x more frequent (22 vs 10) and by the sequence of onset: they generally precede breast cancer, whereas they tend to follow cervical cancers. In contrast to the breast cancer/uterine cervical cancer association, which is considered to be fortuitous, the breast cancer/cancer of the uterine body association appears to be determined by a hormonal context. Through a review of the literature, a unifying endocrine theory is constructed, based on the role of hyperestrogenesis in mammary and endometrial carcinogenesis.