RET tyrosine kinase receptor mutations in MEN2, FMTC, and SMTC

MEN2: multiple endocrine neoplasia type 2; FMTC: familial medullary thyroid cancer; SMTC: sporadic medullary thyroid cancer; HSCR: Hirschsprung disease; MEN2A: multiple endocrine neoplasia type 2A; MEN2B: multiple endocrine neoplasia type 2B; TK: tyrosine kinase.