PLOD1 and acute lymphoblastic leukemia: Further studies of proven fertility are limited to clarify these findings; however, Bath et al. [21] have observed decreased luteinizing hormone (LH) excretion, decreased LH surge, and high frequency of short (≤11 days) luteal phase (despite regular (26–30 day) ovulatory menstrual cycles) in 12 ALL survivors treated with 18–24 Gy cranial irradiation.