In cases of ATA-RET levels B and C, waiting for an increase in bCT and/or sCT may not guarantee that prophylactic surgery is performed before MTC develops (which would assure patients a life free of diseases and a less-invasive surgical procedure, without any need for central lymph-node dissection)..     ///    The only factor predicting the risk of MTC at final histology was an ATA-RET risk level C. 