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. 2023 Sep 16;9(9):e19818. doi: 10.1016/j.heliyon.2023.e19818

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© 2023 The Authors

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Fig. 4 — Kaplan-Meier curves for survival stratified by lymph node stage and metastasis. A: Overall survival stratified by lymph node stage (N stage). OS was significantly worse in patients with stage N1 than in the N0, N2, and N3 groups. B: Progression-free survival stratified by N stage. PFS was significantly decreased in patients with stage N1 and N3 than in the N0 and N2 groups. C: Overall survival stratified by lymph node metastasis. Patients with lymph node metastasis after surgery (N+) had significantly worse OS than those without lymph node metastasis (N-) (HR = 0.01607, CI 0.001620 to 0.1594; p = 0.0004). D: Progression-free survival stratified by lymph node metastasis. Patients with lymph node metastasis (N+) had significantly worse PFS than those without lymph node metastasis (N-) (HR = 0.08757, CI 0.02284 to 0.3357; p = 0.0004). The N+ group had a significantly higher rate of disease progression than the N- group.