Feasibility of nodal classification for non-small cell lung cancer by merging current N categories with the number of involved lymph node stations.

Thorac Cancer · 2019 · PMC6610263 · PMID 31207184

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found that there was no significant difference in survival between N1a and N1b, while N1a showed a trend toward better survival and had a higher five‐year survival rate (73%) than was found for N1b (54%). 25 Regarding the effect of nLNS on the prognosis of N2 cases, two Japanese studies provided support for our view that the survival rate is significantly better for N2a than for N2b disease. 26 , 27 H

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