RET and thyroid cancer: However, because IHC for mBRAF cannot identify metastatic carcinomas carrying other mutations, such as NRAS codon 61 mutations, RET/PTC rearrangements, and NTRK3-ETV6 translocations, other ancillary techniques are required to more appropriately discriminate metastasis from ETTs in cervical LN resected from patients with thyroid cancer.