In patients with endometriosis and adhesion disease, there was reported a positive correlation between the percentages of CD4+CD25+highFoxp3+ regulatory T cells and CD19+CD200 cells, as well as a negative correlation between the percentages of CD3+CD16+CD56+ NK cells and 19+CD200 B cells, which indicated a particularly intense immunosuppression in this group. This evidence concerns the gene CD200 and endometriosis.