APOC1 and polycystic ovary syndrome: In the present study, we investigated the relationship between the rs4420638A/G and -317H1/H2 polymorphisms of the apoC1 gene and the risk of PCOS, evaluated the effects of the genotypes on clinical and metabolic indexes and PAF-AH activity and defined the association of apoC1 gene variations with apoE allele status in southwest Chinese women with or without PCOS using relatively large sample sizes.