The BRAF V600E mutation is present in 45–80% of classical PTC, 5–25% of follicular variants of PTC or FVPTC, 1.4% of follicular thyroid carcinomas, 5–15% of poorly differentiated thyroid carcinomas or PDC, and 10–50% of anaplastic thyroid carcinomas [38]. Here, BRAF is linked to thyroid gland undifferentiated (anaplastic) carcinoma.