The purpose of the study was to determine the level of expression of estrogen and progesterone receptors in endometrial tissue and to determine their relationship with the level of vitamin D in the blood of women of childbearing age with endometrial hyperplasia and benign breast tumors. Materials and methods. Examination of women of reproductive age who were diagnosed with hyperplastic processes in the endometrium was carried out. The examined patients were divided into two groups: Group I – the comparison group, which included patients with endometrial hyperplasia without concomitant pathology; Group II – women who, along with endometrial hyperplasia, were diagnosed with benign breast disease in the form of mastopathy. An immunohistochemical method using the En Vision imaging system with diaminobenzidine was used to detect estrogen and progesterone receptors in the endometrium. Determination of 25-hydroxyvitamin D (25OHD) content in blood plasma was performed by enzyme-linked immunosorbent assay using the 25-Hydroxy test kit. Results and discussion. It was found that the level of estrogen receptors expression increases in all types of endometrial hyperplasia and is exacerbated in concomitant mastopathy. Along with the increase in the level of estrogen receptors expression in endometrial cells, the expression of progesterone receptors decreases. It was found that the amount of progesterone receptors in the main group decreased by 38.3% – in endometrial hyperplasia without atypia, by 46.3% – in atypical endometrial hyperplasia and by 20.4% – in endometrial polyps compared with the control group of women. Analysis of the results shows an association between the form of hyperplasia and the receptor phenotype of the endometrium. It is established that the greatest changes are observed in atypical endometrial hyperplasia, which are exacerbated during the development of proliferative processes in the mammary glands. The relationship between vitamin D deficiency and estrogen and progesterone receptor expression in women with endometrial hyperplasia has been shown. Thus, when the level of estrogen and progesterone receptors changes in the endometrium of women with endometrial hyperplasia and mastopathy, the concentration of vitamin D in blood plasma decreases. Conclusion. The development of hyperplastic processes in the endometrium and mammary glands occurs against the background of increased expression of estrogen receptors and decreased expression of progesterone receptors. At the same time in the blood plasma of patients a decrease in vitamin D was revealed

Keywords: estrogen receptors, progesterone receptors, vitamin D, endometrial hyperplasia, mastopathy

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