Of the patients with ATC, 62 cases (47.7%) had BRAF V600E mutation, 36 cases (27.7%) had RAS mutations, and 2 cases (1.5%) had RET fusion, which suggests that some cases of PTC and FTC transformed into ATC as inheriting driver genes (Fig. 2B). Here, RET is linked to thyroid cancer, nonmedullary, 2.