RecruitingPhase 1Drug trialZoledronate to Prevent Bone Health Complications in Pediatric Hematopoietic Stem Cell Transplant SurvivorsThe purpose of this pilot study is to investigate the safety and preliminarily assess efficacy of early intervention with zoledronate in high risk pediatric hematopoietic stem cell transplantation (HSCT) patients to prevent the development of bone disease and fractures and reduce potential pain and suffering.