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On multivariable analysis, N1 disease (hazard ratio, 2.93; 95% confidence interval, 1.17-7.34; P=.022) and tumor length (hazard ratio, 1.44; 95% confidence interval, 1.12-1.86; P=.004) were independently associated with recurrence. Risk stratification showed that patients without lymphovascular invasion and a with median tumor length of 0.8cm (range, 0.10-1.70cm) had a 10% risk of recurrence and improved survival. Pathologic T1 tumors have a 5-year cumulative incidence of recurrence of 15%. Nodal involvement and tumor length were independent risk factor