This study found two endometriosis-associated SNPs, rs1434536 (P = 0.010) and rs1970801 (P = 0.0087), located within and next to a miR-125b binding site on BMPR1B. Interestingly, patients with homozygous variant alleles at rs1434536 showed significantly lower serum CA125 levels. This evidence concerns the gene MUC16 and endometriosis.