Patients' characteristics
tumor, tumors, extranodal extension
TUMOR, TUMORS, CAVITY
This study analyzed the medical records of 71 patients who met the inclusion criteria and received treatment at the Department of Radiotherapy of Donostia University Hospital. Of the patients examined, 36 (50.7%) underwent bilateral dissection, while 35 (49.3%) underwent unilateral dissection. A majority of the patients were men (80.3%) and the population above the age of 60 was 59.2%. The most common primary site was found to be the oral cavity (35.2%), followed by the larynx (25.4%). Nearly half of the patients had T4 tumors, while approximately 40% had T1‐T2 tumors. Among the 71 patients, 21 (29.6%) were found to have TDs (6 TDs + ENE and 15 TDs without ENE), whereas 50 patients had ENE, comprising of 38 pN2a‐ENE (53.5%) and 12 pN3b‐ENE (16.9%). VIF values indicated that collinearity was not a significant concern (Table Patient and tumor characteristics (Abbreviations: ENE, extranodal extension; LRT, likelihood ratio tests significance; TD, tumor deposit; VIF, variance inflation factor.Mann–Whitney U (2 independent samples).Kruskal‐Wallis 1‐way ANOVA (Intensity‐modulated radiotherapy was administered at five fractions per week. The treatment began between 4 and 8 weeks after surgery in all cases. The median dose prescription was 64.5 Gy for high‐risk regions, administered in 30 fractions (radiation biologically effective dose: 78.37 Gy). Concomitant Cisplatin‐based chemotherapy (CTX) was given to 57.7% of patients, while 21.1% of patients received Cetuximab. Only two cases (2.8%) were treated with Carboplatin‐based CTX (CBDCA), and 18.3% of patients did not receive systemic treatment.