Two biomarkers of the potential activity of resveratrol are measured in nonmalignant and malignant colorectal tissue biopsy samples: levels of M_1G adducts by immunoslot blot analysis and levels of cyclooxygenase-2 protein/Ki67 by immunohistochemistry. Blood samples are collected at baseline and during colorectomy for analysis of resveratrol and its metabolites and other pharmacokinetic studies.