BRAF and differentiated thyroid carcinoma: However, invasive EFVPTC is associated with more BRAF-type mutations than noninvasive EFVPTC (which is associated with more RAS-type mutations), and follicular variants of papillary thyroid carcinoma are more frequently found to harbor RAS-type mutations than classic variants of papillary thyroid carcinoma (more BRAF-type mutations) [55].