Meta-regression analysis coefficients for serum resistin and follistatin levels in the examined group of studies showed that difference of mean age (Coefficient: 0.24, SE: 0.22, p = 0.30) and sample size (Coefficient: 0.003, SE: 0.003, p = 0.50) did not change the relation of resistin to PCOS. The gene discussed is RETN; the disease is polycystic ovary syndrome.