[Therapy and prognosis of medullary thyroid cancer].

Medullary thyroid cancers have different morphological, endocrine and biological qualities than all the other tumors of the thyroid. Therapy is the thyroidectomy with modified, radical neck dissection. The ten year survival rate was 65% in our own patient material. The prognosis depended on tumor size, invasion of vessels by the tumor, grade of differentiation, tumor stage, metastasis and radicality of the operation.