<qa>  What is the purpose of the phase III randomized study?The purpose of this study is to confirm the value of concurrent chemoradiotherapy in improving the locoregional control and survival of patients with resected locally advanced HNSCC, a phase III randomized study is proposed. The population studied in this trial is limited to patients of oral cavity cancer; this could reduce the confounding factor of varying prognosis in patients of different primary sites of HNSCC. 