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  • Title: Endometrial changes in postmenopausal breast cancer patients receiving tamoxifen.
    Author: Lahti E, Blanco G, Kauppila A, Apaja-Sarkkinen M, Taskinen PJ, Laatikainen T.
    Journal: Obstet Gynecol; 1993 May; 81(5 ( Pt 1)):660-4. PubMed ID: 8469450.
    Abstract:
    OBJECTIVE: To assess the estrogenic effect of tamoxifen and associated pathologic changes of the endometrium in postmenopausal breast cancer patients. METHODS: The endometrium of 103 gynecologically asymptomatic postmenopausal breast cancer patients was examined. Fifty-one had been treated with tamoxifen and 52 had not received any hormonal treatment. The two groups were similar in age, parity, age at menopause, and body mass index. RESULTS: Compared with the control subjects, the tamoxifen patients had a thicker endometrium (mean +/- standard deviation 10.4 +/- 5.0 versus 4.2 +/- 2.7 mm; P = .0001) and larger uterine volume (45 +/- 27 versus 25 +/- 11 cm3; P = .001), as determined by transvaginal sonography. Hysteroscopy showed an atrophic endometrium in 28% of the patients in the tamoxifen group, as compared with 87% of the control patients (P = .0001). Endometrial polyps were more frequent in the tamoxifen group (36 versus 10%; P = .004), which included one patient with atypical hyperplasia, one with adenomatous hyperplasia, and one with endometrial adenocarcinoma; two controls had endometrial adenocarcinoma. CONCLUSION: The results provide evidence for an estrogenic effect of long-term tamoxifen treatment on the postmenopausal uterus and show it to be associated with an increased occurrence of polyps.
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