Comparing the clinical characteristics of the two groups, the age, BMI, years of infertility, type of infertility, basal FSH, basal LH, basal E2, basal progesterone, endometrial thickness on the transplantation date, number of previous transplantation failures, whether infertility was due to male factor, whether infertility was due to pelvic tube factor, whether combined with endometriosis, whether combined with endometrial polyps, whether combined with polycystic ovary syndrome in both groups The differences were not statistically significant (P > 0.05). This evidence concerns the gene PLOD1 and endometrial polyp.