title: Endometrial mullerian adenosarcoma after toremifene treatment in breast cancer patients: a case report.
abstract: Toremifene is an anti-estrogen which has been shown to be effective in the treatment of breast cancer, and is thought to be a less uterotrophic agent than tamoxifen. The risk assessment concerning endometrial cancer has been inconclusive because of its rare use up to the mid-1990s. We report a case of an adenosarcoma, which is a very rare type of uterine malignancy, after toremifene treatment for 5 years in a breast cancer patient. After 1 year of toremifene use, the patient had a benign Mullerian adenofibroma. After an additional 4 years of toremifene treatment, the endometrial polypoid lesion was transformed into a Mullerian adenosarcoma. Although toremifene is a promising anti-estrogenic agent in the treatment of breast cancer patients, clinicians should not neglect the possibility of a uterine malignancy.
authors.affiliation: Department of Obstetrics and Gynecology, Korea University College of Medicine, Seoul, Korea.
authors.forename: Ye Won
authors.initials: YW
authors.lastname: Chung
authors.forename: Hyo Sook
authors.initials: HS
authors.lastname: Bae
authors.forename: Song I
authors.initials: SI
authors.lastname: Han
authors.forename: Jae Yoon
authors.initials: JY
authors.lastname: Song
authors.forename: In Sun
authors.initials: IS
authors.lastname: Kim
authors.forename: Jae Seong
authors.initials: JS
authors.lastname: Kang