Intermediate-risk thyroid carcinoma: indicators of a poor prognosis.

Objective: The intermediate-risk (IR) category includes tumors with different degrees of aggression. We aimed to identify the risk factors associated with unfavorable response to initial treatment and compare the effect of low/high radioactive iodine (RAI) therapy.

Methods: A total of 614 IR patients were selected from a database, during 1972-2015.