Similar MTC prevalence were highlighted in subjects who inherited the RET variant from the mother or the father [43,44], while lymph node metastases were more frequent in patients who received the gene pathogenic variant from the father compared with the mother (45% versus 19%, p = 0.006 and 43% versus 29%, p = 0.029) [43,44] (Table 6). The gene discussed is RET; the disease is medullary thyroid gland carcinoma.