“…Rates of survival for pediatric cancers have improved, and aggregate 5-year survival rates now exceed 80% with most patients living into adulthood ( 1 ). Sixty percent of survivors of pediatric cancers will have a serious long-term complication that may include infertility ( 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ). Alkylating chemotherapeutics or radiation fields that include the hypothalamus or gonads cause a significantly increased risk for premature gonadal insufficiency and/or infertility ( 4 , 5 , 6 , 8 , 10 , 11 , 12 , 13 , 14 ).…”