Analyzing and Solving Exceptional Long-term Survivors in Solid Tumors With Poor Prognosis

This study is looking at patients who have survived unusually long after being diagnosed with cancers that typically have very poor outcomes — specifically metastatic pancreatic cancer, glioblastoma (a brain cancer), and extensive small cell lung cancer. By studying these "exceptional survivors," researchers hope to discover what biological or genetic factors allowed them to live so much longer than expected. **You may be eligible if...** - You are 18 years or older at the time of your cancer diagnosis - You have been diagnosed with metastatic pancreatic cancer, glioblastoma (IDH-wildtype), or extensive small cell lung cancer - You have survived at least 5 years from a stage IV diagnosis (for pancreatic and lung cancer) or at least 3 years (for glioblastoma) - Stored tumor tissue and clinical records from your diagnosis are available **You may NOT be eligible if...** - You have not reached the required survival threshold - You do not have one of the three qualifying cancer types - Required tumor tissue samples or clinical records are not available Talk to your doctor to see if this trial is right for you.