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Kaplan-Meier survival curves of Overall Survival. A: Vascular endothelial growth factor receptor 1 (VEGFR1) expression (low vs high, P = 0.003); B: Class III β-tubulin (TUBB3) expression (low vs high, P = 0.017); C: TUBB3 and VEGFR1 (both low expression vs others, P = 0.003); D: TNM stage and VEGFR1 (stage III + high VEGFR1 expression vs others, P < 0.001).
