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. 2011 Jun 13;6(6):e19557. doi: 10.1371/journal.pone.0019557

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Wang 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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3A: Overall survival curves showed different outcomes among patients with T4a, EM1 and T4b (P = 0.002 and 0.016, respectively). 3B: Overall survival of patients with EM1 was worse than those of the N2 stage and was comparable to those of the N3 stage (P = 0.039 and 0.437, respectively). 3C: Patients with EM2 had a comparable overall survival with those of the M1 stage (P = 0.896).