Effect of resveratrol on leukemia colony-forming cell proliferation of fresh AML cells from 5 patients. After fractionation of adherent cells and depletion of T lymphocytes, remaining cells were cultured in a clonogenic assay with resveratrol at concentrations ranging from 5.0 to 50 μM. AML colonies are presented as percentages of control. (The mean numbers of colonies obtained from patients 1 through 5 in the absence of resveratrol were 65, 196, 153, 256, and 549, consecutively.)