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Tumorigenic Effects of Tamoxifen on the Female Genital Tract

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Author(s): Kaei Nasu | Noriyuki Takai | Masakazu Nishida | Hisashi Narahara

Journal: Clinical Medicine : Pathology
ISSN 1178-1181

Volume: 1;
Start page: 17;
Date: 2008;
Original page

Keywords: tamoxifen | tumorigenicity | ovary | uterus | estrogenicity | breast cancer

ABSTRACT
Tamoxifen is widely used for endocrine treatment and breast cancer prevention. It acts as both an estrogen antagonist in breast tissue and an estrogen agonist in the female lower genital tract. Tamoxifen causes severe gynaecologic side effects, such as endometrial cancer. This review focuses on the effects of prolonged tamoxifen treatment on the human female genital tract and considers its tumorigenicity in the gynecologic organs through clinical data analysis. Tamoxifen is associated with an increased incidence of benign endometrial lesions such as polyps and hyperplasia and a two- to four-fold increased risk of endometrial cancer in postmenopausal patients. Moreover, the incidence of functional ovarian cysts is significantly high in premenopausal tamoxifen users. To prevent tamoxifen from having severe side effects in gynaecologic organs, frequent gynecological examination should be performed for both premenopausal and postmenopausal patients with breast cancer who are treated with this drug.
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