Reinehr et al. reported significant differences in FSH levels (p = 0.018) and FSH/inhibin B ratios (p = 0.020) between boys with gynecomastia and those without, based on a cohort of 124 boys, of which 86 had true gynecomastia and 38 had pseudogynecomastia. Here, BRD2 is linked to Gynecomastia.