Effects of piroxicam alone and in combination with CDDP on cell cycle regulatory proteins. CycD1 was analysed by western blotting in MSTO (left side) and NCI (right side) treated with piroxicam and/or CDDP for different times. Electrophoretic bands were analyzed using Scion Image program. Experiments were repeated in triplicate and media values and standard deviations were calculated. CTRL = control; P = piroxicam; C = CDDP.