Preoperative treatment schedules at the Department of Oral and Maxillofacial Surgery, Kagoshima University. The treatment schedules of the S-1 and AI groups are shown (upper panel) and the actual waiting time for surgery is shown in the box plot (lower panel). S-1, concurrent neoadjuvant chemoradiotherapy with S-1 and a total external irradiation dose of 30 Gy; AI, concurrent neoadjuvant chemoradiotherapy using super-selective intra-arterial infusion with cisplatin or carboplatin and a total external irradiation dose of 40 Gy; CDDP, cisplatin; CBDCA, carboplatin; AUC, area under the receiver operating characteristics curve.