Although well differentiated thyroid carcinoma is usually associated w
ith a favorable outcome, a small percentage of patients die from their
cancer. In order to determine the risks for a specific patient, vario
us prognostic scores have been established. The more famous are AMES,
AGES, the score designed by the EORTC classification and an other by W
HO based on TNM classification. From these studies, two clinical crite
ria have the best prognostic value: age at the time of diagnosis and s
tage of the disease. Other factors, less effective in predicting the p
rognosis are the degree of histological differentiation of the tumor,
sex of the patient and nodal status.