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Group description: Group 1: tumour-free distance (TFD) > 3.5**, N0**; Group 2: TFD ≤ 3.5**, N0**; Group 3: TFD ≤ 3.5**, N1**. Two patients without event are not included in the groups: minimal tu-pcf (US) > 3.5**; a number of positive LN > 0**. *Log-rank test. **Cut-off determined by ROC analysis, the criterion was the highest value of the sum of sensitivity and specificity.
