KRAS and thyroid cancer: The main findings of this study were (1) The thyroid cancers samples were consisted of papillary type carcinoma (74.0%) and follicular type carcinoma (26.0%), (2) BRAF-V600E mutation were found in 40.3% of thyroid carcinoma samples, (3) KRAS mutation was found in 41.3% of BRAF negative thyroid carcinoma samples, with predominant follicular type, and (4) EGFR mutation was observed in 45.7% of BRAF negative thyroid carcinoma samples, with predominant papillary type.