Moreover, for follistatin, there were 4 publications comparing circulating follistatin in non-obese PCOS women vs. non-obese healthy controls [15, 65–67], 2 studies on obese PCOS vs. obese healthy women [17, 65], and 2 studies on obese PCOS vs. non-obese PCOS patients [65, 67]. The gene discussed is FST; the disease is polycystic ovary syndrome.