We performed IHC for NRAS(Q61R) and direct sequencing for NRAS codon 61 in 4 thyroid cancer-derived cell lines and 98 follicular-patterned thyroid tumors that included 22 follicular thyroid adenomas (FTAs), 35 follicular thyroid carcinomas (FTCs), and 41 cases of nodular hyperplasia (NH).
The results of this study allow us to conclude that low expression of MLH1 is associated with BRAF V600E mutations, RET/PTC rearrangements and transitions (IDH1 and NRAS) in patients with thyroid carcinoma.