C3 and polycystic ovary syndrome: Since complement C3 correlated with BMI in the women with PCOS despite them having a normal BMI, further correlations with BMI, HOMA-IR and CRP were performed for proteins alpha-1-antichymotrypsin, apolipoproteins A-1, B, D, E, E2, E3, E4, L1 and M, clusterin, hemopexin, heparin cofactor II, kininogen-1, serum amyloid A-1, amyloid beta A-4 and paraoxonase-1.