The histological findings of PTC/MTC do not differ from those of the isolated PTC and MTC forms, while the MMFTC form can be present in at least three ways: MTC and follicular cell hyperplasia, MTC and PTC and MTC and DTC with cells positive for both calcitonin and thyroglobulin at immunostaining evaluation [29]. The gene discussed is CALCA; the disease is medullary thyroid gland carcinoma.