In the group of sporadic PTC patients, only one patient (with a GG genotype at the HABP2 variant) was classified as FNMTC according to the algorithm applied by our Outpatient Genetic Clinic (FNMTC was defined as the presence of at least three cases of PTC in a family). Here, HABP2 is linked to familial papillary or follicular thyroid carcinoma.