RATIONALE: Studying samples of tissue, blood, urine, stool, and other biological fluids from patients with cancer and from healthy volunteers undergoing colonoscopy or endoscopy may help doctors identify and learn more about biomarkers related to cancer. PURPOSE: This research study is looking at gastrointestinal biomarkers in tissue and biological fluid samples from patients and participants undergoing colonoscopy, endoscopy, or surgery.
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Identification of new potential biomarkers of increased gastrointestinal cancer risk using tissue and biofluid samples from patients undergoing colonoscopy, endoscopy, or surgery
Timeframe: Through study completion, approximately 30 years
Development of new screening strategies based on substances found in tissue and biofluid samples
Timeframe: Through study completion, approximately 30 years