We screened for mutations in the most relevant oncogenes/tumor suppressor genes affected in thyroid carcinogenesis: RAS, BRAF, CTNNB1, and TP53 along with RET/PTC rearrangements.     ///    "The panel of cell lines we have studied displayed activation of several oncogenes (BRAF, RAS, RET/PTC) and inactivation of tumor suppressor genes (TP53) known to be important for thyroid carcinogenesis. "