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. 2012 Mar 26;7(3):e34087. doi: 10.1371/journal.pone.0034087

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Song et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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A: The number of patients who had stage migration in different subcategories. B: Survival curves showed different prognostic outcomes among patients with pN1a, pN1b, pN2a, and pN2b (P<0.001). C: Survival curves showed different prognostic outcomes among patients with npN1a, npN1b, npN2a, and npN2b (P<0.001).