DAB2 and neoplasm: Comparison of the reduction rate of tumor weight in LK and SPC cells with X-ray irradiation (74.4% VS 43.31%, Fig. 6b, P < 0.05), demonstrates that LK cells with hypermethylation of the Dab2 gene promoter are more sensitive to X-ray treatment than SPC cells with hypomethylation of the Dab2 gene promoter.