3. Postoperative adjuvant chemoradiotherapy
Postoperative radiotherapy alone was performed in 70 cases, whereas postoperative concurrent chemoradiotherapy was performed in 18 cases. The target areas of radiotherapy included the primary focus and the cervical lymphatic drainage area. All patients were treated with intensity-modulated radiotherapy (IMRT). The dose of radiotherapy was 50–66 Gy/25–33 f, 1.8–2.0 Gy/f, 5 f/W. The concurrent chemotherapy regimen was combined chemotherapy based on cisplatin.