2020 Volume 29 Issue 3 Pages 273-278
The TNM classification was revised to the 8th edition in 2016. In the revision for oral cancer, the depth of invasion（DOI）in classification T and the extranodal extension（ENE）in classification N were newly introduced. Between 2007 and 2016, 93 patients with tongue cancer were treated in our hospital and evaluated for TNM classification according to the 7th and 8th editions. The 3-year disease-specific survival rate based on the 8th edition was 72.3％; stageⅠ（25 cases）: 89.9％, stageⅡ（17 cases）: 80％, stageⅢ（15 cases）: 70％, stageⅣA（31 cases）: 64.2％, and stageⅣB（5 cases）: 20％. Twenty-nine cases developed recurrences and the total salvage rate of recurrence was 36％（10 cases）. The 8th TNM classification reflected the prognosis more clearly than the 7th edition.
