CDH1 and thyroid gland papillary carcinoma: Previous observations show that upregulation of E-cadherin and a concomitant reduction in MMP-2/MMP-9 levels might negatively regulate cell proliferation, invasiveness, and adhesion of K1 papillary thyroid cancer cells and pancreatic cancer cell lines MIAPaCa-2 and BxPC-3 [28,29].