Prospective Single-center Study About the Use of ctDNA in the Management of Patients With Tumors of the Gastrointestinal Tract

This study looks at using a special blood test to help manage cancer in the stomach, intestines, and other digestive areas. The test checks for ctDNA, which stands for circulating tumor DNA. This is tiny pieces of DNA from cancer cells that float in the blood. By studying ctDNA, doctors hope to better understand and treat these types of cancer. The study is observational, meaning it watches and records what happens without giving any new medicine. It's being done at one location and keeps patient information private. People will have blood and poop samples taken at different times to see how their cancer is doing.

• The study requires visits to give blood and stool samples but doesn’t involve taking new medicines.
• Only adults over 18 with certain types of stomach or intestinal cancer can join.
• Personal information is kept private, and no drug companies are involved.