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. 2021 Feb 5;14:845–855. doi: 10.2147/OTT.S291327

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© 2021 Lee et al.

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Kaplan–Meier survival curves for recurrence-free survival (RFS) according to (A) pathologic T stage, (B) pathologic N stage, (C) PD-L1 expression score, and (D) PD-L1 expression positivity.