Concentrations of resveratrol and resveratrol-3-O-sulfate in normal colon and tumor tissue of a patient with a cecal (right-sided) and a sigmoid colonic tumor (left-sided), who had received resveratrol at a dose of 1.0g daily for 8 days. Normal tissue samples were taken at a distance of 5cm proximal or distal from tumor, and from the distal resection margin (RM). Differences in levels between the left and right side, similar to those shown here, were observed for resveratrol disulfate and the two resveratrol monoglucuronides, but not for resveratrol sulfate glucuronide.