Koos Boeve

43 8th TNM classification prognostic value in oral cancer Table 2. Disease specific survival rates , 95% confidence intervals and log-rank test of all stages Edition Category Survival Log-rank test 5yr, % 95% CI Compared groups p-value 7 th pT class T1 89 82 to 93 T1 vs T2 0.002 T2 72 61 to 81 8 th pT class T1 91 81 to 96 T1 vs T2 0.077 T2 81 72 to 87 T2 vs T3 0.048 T3 66 45 to 80 T1 vs T3 0.001 7 th pN class WW 89 73 to 86 WW vs N0 0.734 N0 92 84 to 96 N0 vs N1 0.005 N1 73 54 to 86 N1 vs N2 0.264 N2 59 42 to 73 N2 vs N3 0.402 N3 0 NA 8 th pN class WW 89 73 to 96 WW vs N0 0.734 N0 92 84 to 96 N0 vs N1 0.016 N1 75 53 to 88 N1 vs N2 0.793 N2 69 46 to 84 N2 vs N3 0.072 N3 48 26 to 67 7 th SG class WW 89 73 to 96 WW vs Stage I 0.195 Stage I 96 86 to 99 Stage I vs Stage II 0.056 Stage II 85 70 to 93 Stage II vs Stage III 0.184 Stage III 73 54 to 86 Stage III vs Stage IV 0.220 Stage IV 58 40 to 72 8 th SG class WW 89 73 to 96 WW vs Stage I 0.270 Stage I 97 78 to 99 Stage I vs Stage II 0.594 Stage II 94 83 to 98 Stage II vs Stage III 0.007 Stage III 74 58 to 85 Stage III vs Stage IV 0.167 Stage IV 59 43 to 72 Abbreviations: CI, confidence interval; N, nodal; T, tumour; NA, not applicable; SG, stage grouping; WW, watchful waiting.