CYP19A1 and polycystic ovary syndrome: The present study was designed to investigate the ef-fect of EPA on the expression levels of peroxisome proliferator-activated receptor gamma(PPARγ) and cytochrome P450 aromatase (encoded by the CYP-19) in primary culturedgranulosa cells (GC) from patients undergoing in vitro fertilization (IVF), and also tocompare these effects with those in GC of PCOS patients.