RB1 and endometriosis: Furthermore, in non-endometriosis subjects with an LBW history, we also found significant negative correlations (r = −0.797; p = 0.001) between PR-B expression and DNMT1 expression; between DNMT1 expression and VEGF expression (r = 0.616; p = 0.025); and, also, between PR-B methylation and PR-B expression (r = −0.558; p = 0.047).