C5 and polycystic ovary syndrome: Notably, the levels of four inflammatory cytokines, including complement component C5/C5α, CXCL12/SDF-1, MIF, and Serpin E1/PAI-1, were significantly elevated in overweight PCOS compared with those in non-overweight PCOS based on our Protein microarray analysis, and this is the first report on the correlation different inflammatory cytokines’ correlation with the BMI of PCOS.