RESEARCH COMMUNICATIONS OF THE 28th ECVIM-CA CONGRESS

Medical records of dogs with thyroid tumors that underwent thyroidectomy between 1994 and 2013 were reviewed. From each dog the following variables were collected at admission to determine their influence on overall survival, defined as the time from surgery to death: age, gender, breed, T4 and TSH concentration, unilateral or bilateral lobectomy, type of surgery (thyroidectomy combined or not with muscular and jugular vein resection), institution where surgery was performed, tumor major diameter, histological type, presence of thrombosis and metastasis, administration of adjuvant chemotherapy. Median survival was calculated with Kaplan‐Meier product‐limit. Outcome predictors were studied using Cox proportional hazard models. The final model was built with stepwise deletion guided by the Akaike information criterion.