Estrogenic activity and estrogenic chemicals in landfill leachate were investigated by yeast two-hybrid assay and chemical analysis. Leachate sample extracted by liquid-liquid extraction with dichloromethane at pH 7.0 showed a higher dose-response curve than sample extracted at pH 3.0. or than sample extracted by solid phase extraction at either pH 7.0 or 3.0. The fraction extracted at pH 3.0 specifically inhibited not only growth of yeast but also estrogenic activity in this assay, suggesting that it contained anti-estrogenic chemicals. The greatest contributor to estrogenic activity among the chemicals identified in leachate extract was bisphenol A, with an estimated contribution ratio of 84%. The contribution ratios of 4-nonyl phenol (4-np) and 4-tert-octyl phenol (4-t-op) were estimated at 1.0%, and 0.1%, respectively, while natural estrogens such as 17beta-estradiol or estrone were below detection limit, so that their contribution ratio was estimated at no more than 10%. The estrogenic activity of leachate was decreased by aeration treatment alone after 7 days, and was no longer detected after 22 days. Concentrations of bisphenol A, 4-np and 4-t-op likewise decreased with aeration.
Congenital anomalies of the uterus can result from developmental disorders of the Müllerian ducts. The precise incidence of congenital uterine malformations remains unclear, but the reported incidence is 4-5% of the general female population and it might be higher among patients with infertility or repeated miscarriages. Failure to resorb septa between the Müllerian ducts leads to the formation of a septate uterus, which, when combined with cervical duplication and a longitudinal vaginal septum, represents a rare congenital malformation. Although infertility is associated with uterine malformations, only a few reports have described endometrial neoplasia arising in patients with congenital uterine malformations.Endometrial polyps are caused by the localized overgrowth of endometrial glands and stoma through the uterine cavity, and they are associated with postmenopausal bleeding, infertility, and menorrhagia. The prevalence of malignancy with endometrial polyps is 0.52-3.5%. Risk factors for malignancy within polyps include ageing, obesity, arterial hypertension, postmenopausal period, and tamoxifen, which is a nonsteroidal anti-estrogenic agent that is a popular adjunctive therapy for women with breast cancer. Several reports over the past decade have indicated an increase in the incidence of endometrial abnormalities ranging from polyps to endometrial cancer in women undergoing treatment with tamoxifen.We describe a giant endometrial polyp in a complete septate uterus with longitudinal vaginal septum in an 81-year-old patient with breast cancer who had been treated with tamoxifen for 3 years and 7 months.
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