CD4 and endometriosis: Figure 1 shows the prevalence of different subsets of TLR2+ cells in patients with stages 1–4 of endometriosis and in the control group. We found a statistically significant correlation between the frequencies of T CD4+TLR2+ lymphocytes and HE4 serum concentration (r = 0.395; p = 0.0112), as presented in Supplementary Figure S5.