Study of the Complications Associated With Certain Stem Cell Transplants

Study Summary

Background: \- The National Institutes of Health (NIH) performs up to 100 allogenic stem cell transplants (allo-HSCT) each year. Many studies already look at different problems that can follow a transplant. But there are many types of transplants, diseases, responses, and treatments. An organized study of this information could help researchers learn more about how often transplant complications occur and what problems they cause. It could also lead to ideas for future research. This study will focus on complications thought to be the most significant. Objectives: \- To gather information on the complications that may occur after an allo-HSCT. Eligibility: \- People over 2 years of age currently enrolled in an allo-HSCT study at NIH. Design: * Visits for this study will be scheduled along with primary study visits. The number of visits will depend on the primary study schedule. * At each visit, participants will answer questions and take physical exams. * The same questions and physical exams will continue for as long as they are in the primary study. * In between visits, researchers might call participants to discuss their health. They may also discuss the cases with the primary study doctors and other doctors. Primary transplant study doctors will make treatment decisions. * When participation in the primary transplant study ends, participation in this study will also end.