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Kaplan-Meier survival curve demonstrates that the 5-year (A) overall survival, (B) disease-free survival, (C) locoregional recurrence-free survival, and (D) distant metastasis-free survival rates for patient subgroups stratified by PIV levels using 268 as the cutoff values were 74.1% vs. 56.4%, 67.1% vs. 52.3%, 67.6% vs. 53.1%, and 73.9% vs. 56.5%, respectively (p < 0.001, <0.001, <0.001, and <0.001). The p values were calculated with the log-rank test.
