As shown in Figure 1, the rank order according to the MDR1-β-actin ratio in the gastric cancer cell lines is as follows: SNU-668 (1.51) > SNU-484 (1.37) > SNU-5 (0.63) > SNU-601 (0.33) > SNU-719 (0.32) > SNU-216 (0.29) > SNU-638 (0.07) > SNU-1 (0.04) > SNU-16 (0). This evidence concerns the gene ACTB and gastric cancer.