Susceptibility genes involved in syndromic FNMTC are known: APC in familial adenomatous polyposis [MIM: 175100], PTEN in Cowden’s disease [MIM: 158350], PRKAR1A in Carney complex type 1 [MIM: 160980], WRN in Werner’s syndrome [MIM: 277700], and DICER1 in the DICER1 syndrome [MIM: 606241], [3]. Here, APC is linked to familial papillary or follicular thyroid carcinoma.