Survival for pN1 and pN2 lung cancer according to single versus multiple nodal stations for R0 and any R settings

Exploratory analyses of survival in pN1 and pN2 according to the number of metastatic nodal stations (single versus multiple) for R0 and any R settings (T-any M0). The pN1 category is divided into pN1 single (N1a) and pN1 multiple (N1b). The pN2 category is further divided into pN2 single (N2a) and pN2 multiple (N2b). Despite their different categories, the survival curves for pN1b and pN2a overlap, with five-year survival rates of 50 and 49% for R0 resection, respectively.