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Correlation analysis and selection of predictors. Platelet‐to‐lymphocyte ratio (PLR), neutrophil‐to‐lymphocyte ratio (NLR) and systemic immune‐inflammation index (SII) were strongly correlated. The Masaoka‐Koga stage and the World Health Organization (WHO) histological classification had a weak but significant correlation (r = 0.226 and p < 0.001). WHO histological classification and extended resection had a weak but significant correlation (r = 0.153 and p = 0.002).
