RET and medullary thyroid gland carcinoma: After this report, the analysis of the NF1 gene in 2 patients with nonhereditary, non-RET, and non-RAS MTC identified NF1 somatic pathogenic variants: 1 in a patient with confirmed diagnosis of NF1 and another in a non-NF1 patient with 2 acquired somatic NF1 genetic alterations [22].