Anal polyp

This study is testing a new surgical stapler, called the Signia circular stapler, in people having left-sided colon, sigmoid, or rectal surgery. The goal is to see if it lowers the chance of a leak where the colon is reconnected. About 137 adults will take part, and the main focu…

This study compares two methods for finding precancerous colon polyps during colonoscopy. Both methods use water instead of air to inflate the colon and an AI system to spot polyps. One group also uses a special light filter called linked-color imaging. The goal is to see if the …

This study aims to collect medical data and biological samples (blood, urine, stool, and tissue) from up to 4,000 adults with known or suspected gastrointestinal diseases. Participants receive standard medical care at the NIH, and any extra samples or leftover tissue from procedu…

This trial is testing whether taking daily fiber supplements can change the types and amounts of bacteria living in the colon. The study involves 120 adults with benign anal or colorectal conditions who are not currently on fiber supplements. Researchers will compare gut bacteria…