Treatment of tonsil cancer, a subset of oropahryngeal cancer, varies between surgery and radiotherapy. Well-designed studies in tonsil cancer have been rare and it is still controversial which treatment is optimal. This study aimed to assess the outcome and failure patterns in tonsil cancer patients treated with either approaches. | Chemoradiotherapy versus surgery followed by postoperative radiotherapy in tonsil cancer Korean Radiation Oncology Group KROG study