THE AIM OF THE STUDY
Was to evaluate the expression of leukemia-inhibiting factor (LIF) in the endometrium during the «implantation window» in women with a history of reproductive dysfunction with different endometrial thickness.
MATERIAL AND METHODS
The prospective cohort comparative study was conducted. The main group included patients with hypoplastic (<7 mm according to ultrasound on preovulatory days) endometrium (n=52); the comparison group included women with normal endometrial thickness (n=62) (women of both groups with reproductive dysfunctions of unknown reason); the control group included 16 healthy fertile women. Aspiration biopsy of the endometrium was performed on the 6th-8th day after ovulation with simultaneous collection of a peripheral blood sample to determine the levels of estradiol (E2) and progesterone (P). Histological and immunohistochemical examination of endometrial samples was performed to determine the expression of estrogen (ER) and progesterone (PR) receptors and LIF.
RESULTS
All study participants had ovulatory progesterone values (P≥16.1 nmol/l (6—8 days after ovulation)) and normoestrogenemia (E2, pmol/l). E2/P was similar in all studied groups (p>0.05). We found, that 20% of women with «thin» endometrium have expression of LIF similar to healthy women. We report these results for women with «thin» endometrium who have normal hormone-receptor characteristics and medium secretory phase transformation of the endometrium.
CONCLUSION
In 20% of women with a history of reproductive dysfunctions with a «thin» endometrium, the expression of sex steroid receptors, proteomic markers (LIF) and phase transformation of the endometrium were the same as in healthy women. «Thin» endometrium is a predictor of a greater percentage of reproductive failures but does not appear to be an absolute predictor of such disorders. There is a group of women with hypoplastic endometrial syndrome who have adequate characteristics of endometrial receptivity and who able to become pregnant in a natural menstrual cycle.