IL-6 expression (Figure 1F) was significantly increased in peritoneal endometriosis (7.44, 7.00–8.84; p = 0.0049), deep infiltrating endometriosis (10.00, 8.20–11.52; p < 0.0001), and ovarian endometriosis (7.80, 7.24–9.63; p = 0.0111) relative to control tissue (7.08, 6.66–7.60) and patient endometrium (6.90, 6.70–7.21). Here, IL6 is linked to endometriosis.