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Concurrent chemotherapy may cause various adverse events and complications, which can greatly influence oral health care or the preoperative detection of complications, whole-body control during treatment, and the subsequent completion rate or response to treatment.We clinically examined the therapeutic effects as well as the disease-specific survival rate, completion rate, adverse events, complications, recurrence rate, and poor performance status in 100 patients who received S-1 plus nedaplatin with concurrent radiotherapy (SN therapy) as primary treatment for head and neck squamous cell cancer in our department between January 2005 and August 2011.The results were as follows : the 3-year disease-specific survival rate was 93.0％, complete response rate was 88.0％, partial response rate was 12.0％ , rate of effect was 100％, and completion rate was 85.0％ . As for adverse events, grade 3 or greater hematologic toxicity and no hematologic toxicity were observed in 66.0％ and 45.0％ of the patients, respectively. Major complications after treatment initiation were observed in 9.0％ of the patients ; the most common complication was delirium in 5.0％ of the patients. The recurrence rate was 13.0％, and 4.0％ of the patients had poor performance status. Therefore, SN therapy was considered effective for head

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