A case–control study reported that patients with stage III/IV endometriosis had significantly lower AMH levels (2.38 ± 1.83 ng/mL) compared to controls undergoing IVF/ICSI due to male factor (3.58 ± 2.46 ng/mL, p < 0.0001), whereas there was no statistically significant difference between those with stage I/II disease and controls [20]. The gene discussed is AMH; the disease is endometriosis.