Disease Outcomes and Toxicities in Patients With Gastrointestinal and Sarcomatous Malignancies

This is an observational study tracking the long-term health outcomes and treatment side effects in people with gastrointestinal cancers (such as stomach, colon, rectal, or pancreatic cancer) or sarcomas (cancers of connective tissue). The study collects real-world data rather than testing a new treatment. **You may be eligible if...** - You are 18 years old or older - You have been diagnosed with a gastrointestinal cancer or sarcoma, confirmed by imaging, biopsy, or cytology - You are willing to provide informed consent and follow-up information **You may NOT be eligible if...** - You are unable or unwilling to provide informed consent - You do not expect to be available for follow-up visits at the required intervals after treatment Talk to your doctor to see if this trial is right for you.