CDH1 and colonic neoplasm: KM12C colon cancer cells were treated with pervanadate to inactivate all tyrosine phosphatases and GST pulldowns using GST, GST–PTP-PEST-WT or GST–PTP-PEST-CS (catalytically inactive C231S trapping mutant) were analyzed by western blotting for E-cadherin, α-catenin, β-catenin and p120 catenin (p120).