BNIP3 and polycystic ovary syndrome: In the PCOS group, the oocyte retrieval rate was significantly and positively correlated with BNIP3 (r=0.766, P=0.010), NOS2 (r=0.837, P=0.003), and NQO1 (r=0.692, P=0.027) mRNA levels, while normal fertilization rate was associated with LPIN1 (r=0.760, P=0.011) mRNA level.