Effects of piroxicam and/or CDDP on cell cycle regulation in MSTO (left panel) and NCI cells (right panel). Cells were treated with piroxicam and/or CDDP for 24 and 48 hours and analyzed to determine cell cycle phase distribution. All the experiments were performed at least 3 times. Media ± Standard deviation of experiments is expressed as percentage of total cells. CTRL = control; P = piroxicam; C = CDDP.