PLOD1 and hypogonadotropic hypogonadism: 6 ALL, 4 neuroblastoma, 1 NHL, 1 HD. HSCT: 6 auto, 6 alloAMH: undetectable or extremely low in allAuto: 1 eugonadism (normal FSH, LH and inhibin B), 1 central hypogonadism (low FSH, LH and inhibin B), 2 primary hypogonadism (high FSH and LH, low/normal inhibin B), 2 combined hypogonadism (low inhibin B, inadequately normal FSH and LH)