While several genes have been proposed as being involved in NS-FNMTC, in familial tumors with an oncocytic (Hürthle cell) phenotype, TCO, NDUFA13/GRIM19, TIMM44 and MYO1F have been identified as susceptibility genes. The gene discussed is NDUFA13; the disease is familial papillary or follicular thyroid carcinoma.