We found that the PLK1 expression levels negatively correlated with the enrichment levels of TILs in 9 cancer types (LUSC, TGCT, STAD, GBM, PAAD, ESCA, LUAD, ACC, and DLBC), and in 4 cancer types (KIRC, THYM, THCA, and BRCA), we observed an opposite trend (Spearman correlation, FDR<0.1) (Figure 1(e)). This evidence concerns the gene PLK1 and cancer.