Prognosis of oral cancer: a comparison of the staging systems given in the 7th and 8th editions of the American Joint Committee on Cancer Staging Manual

The 8th edition of the American Joint Committee on Cancer (AJCC) Staging Manual introduces "depth of invasion" and "extranodal extension" into the head and neck section, and our aim was to find out if these changes have an impact on prognosis. We evaluated 174 patients who had had oral squamous cell carcinomas (SCC) resected between 2003 and 2012. The clinical records were reviewed, the patients' tumours restaged according to the 8th edition of the AJCC, and we analysed five-year survival to verify whether different correlations were made between the T and N stages and disease-specific survival using the 7th and 8th editions.

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