Recruiting Natural History and Biospecimen Acquisition for Children and Adults With Rare Solid Tumors NCT03739827 Conditions Malignant Solid Tumors, Other Neoplasms Solid Tumors, Pediatric Solid Tumor, +2 more Locations National Institutes of Health Clinical Center — Bethesda, Maryland, United States Oregon Health and Science University — Portland, Oregon, United States Texas Children's Hospital — Houston, Texas, United States View Trial Details