Background: Approximately 150 cases of cancer per one million per year are considered rare cancers. While all tumors originate from genetic changes, a small percentage of these tumors are familial. Researchers want to study these changes in biological samples from people with rare tumors in order to learn more about how these tumors develop. The information obtained from this study may lead to improved screening, preventive guidelines, and treatments. Objective: To better understand rare cancers and hereditary cancer syndromes. Eligibility: People who have a rare tumor, a family history of a rare tumor, a hereditary cancer syndrome, or a mutation that leads to rare tumors. Design: Participants will be screened with questions about their medical history and/or that of their family members. They will give a saliva sample. Participants who have a tumor will have their medical records and tests reviewed. They will answer questions about their wellbeing and needs. They may provide a tumor tissue sample. Participants may also have: * Physical exam * Clinical photography * Blood, urine, saliva, and stool samples taken * Consultation with specialists * A scan that produces a picture of the body. Either one that uses a small amount of radiation, or one that uses a magnetic field. * Genetic testing/genetic counseling. Participants will be contacted once a year. They will answer updated questions about their medical and family history. Participants will be asked to contact the study team if there are changes in their tumors. Participants may be invited to join focus groups for people with the same diagnosis of rare tumors. Participants may be invited to participate in other NIH protocols. \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* RARE TUMOR LIST: 1. Acinar cell carcinoma of the pancreas 2. Adamantinoma 3. Adenosqaumous carcinoma of the pancreas 4. Adrenocortical carcinoma 5. Alveolar soft part sarcoma 6. Anaplastic Thyroid Cancer 7. Angiosarcoma 8. Atypical Teratoid Rhabdoid Tumor/MRT 9. Carcinoid 10. Carcinoma of Unknown Primary 11. Chondrosarcoma 12. Chondromyxoid fibroma 13. Chordoma 14. Clear cell renal carcinoma 15. Clear Cell Sarcoma 16. Clear cell sarcoma of kidney 17. Conventional chordoma 18. Dedifferentiated chordoma 19. Desmoid 20. Desmoplastic small round cell tumor 21. Epithelioid hemangioendothelioma 22. Esthenioneuroblastoma 23. Ewing Sarcoma 24. Fibrolamellar carcinoma 25. Fusion negative rhabdomyosarcoma 26. Fusion positive renal cell carcinoma 27. Fusion positive rhabdomyosarcoma 28. Gastro-enteropancreatic neuroendocrine tumor 29. Hepatoblastoma 30. Hereditary Diffuse Gastric Cancer 31. Inflammatory myofibroblastic tumor 32. Kaposiform hemangioendothelioma 33. Malignant ectomesenchymal tumor 34. Malignant peripheral nerve sheath tumor 35. Malignant triton tumor 36. Medullary thyroid cancer 37. Mixed acinar adenocarcinoma 38. Mixed acinar neuroendocrine carcinoma 39. Myxoid Liposarcoma 40. Neuroblastoma 41. Neuroendocrine tumors 42. NUT midline carcinoma 43. Osteosarcoma 44. Pancreas ductal adenocarcinoma with squamous features 45. Pancreatic acinar cell carcinoma 46. Papillary renal cell carcinoma 47. Paraganglioma 48. Parosteal Osteosarcoma 49. Periosteal Osteosarcoma 50. Peripheral nerve sheath tumor 51. Peripheral primitive neuroectodermal tumor 52. Pheochromocytoma 53. Pituitary cancer 54. Poorly differentiated chordoma 55. Renal medullary carcinoma 56. Rhabdomyosarcoma 57. Round cell Liposarcoma 58. Schwannoma 59. Sclerosing Epithelioid Fibrosarcoma 60. SDH deficient GIST 61. SMARCB1 deficient tumors 62. SMARCA4 deficient tumors 63. Synovial sarcoma 64. Undifferentiated Sarcoma \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*
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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
To comprehensively and longitudinally evaluate the natural history of patients with rare solid tumors or tumor predisposition syndromes, estimating and defining their clinical spectrum (e.g. disease course and survival)
Timeframe: 10 years