The protocol will serve as the basis for outpatient clinics that will function within the context of the pediatric and adult endocrine outpatient clinics: every eligible patient referred to the endocrine service from the NCI, NHLBI, and other NIH institutions and centers will be enrolled in this study, which for the first time will create an endocrine database for these patients. As stated in our aims above, it is our hope that the present investigation will serve as an incubator of further research-focused studies with the ultimate goal of improving the life of children and adults who have been cured of their underlying neoplasms as well as those individuals who are recipients of an HSCT.