CD4 and polycystic ovary syndrome: Earlier study demonstrated that the number of lymphocytes, the portion of CD4 + T lymphocytes, and NK cells were significantly elevated in women diagnosed with Polycystic Ovary Syndrome (PCOS) and that CD4 + T cells and NK cells were independent risk factors for PCOS [8], indicating peripheral blood inflammatory-immune cells as promising predictor of infertility among these patients.