Specifically, we showed that the macrophage markers CD68 (BLCA: P =5.42e-42, BRCA: P =3.57e-104, ESCA: P =2.49e-03, OV: P =2.69e-30, PAAD: P =3.28e-14, PCPG: P =1.27e-06, STAD: P =1.27e-19), S100A9 (BLCA: P =5.91e-08, BRCA: P =3.02e-20, ESCA: P =5.48e-04, OV: P =4.16e-02, PAAD: P =4.91e-06, PCPG: P =2.26e-02, STAD: P =6.01e-08) and CSF1R (BLCA: P =4.68e-35, BRCA: P =5.68e-79, ESCA: P =2.27e-07, OV: P =2.15e-19, PAAD: P =4.1e-20, PCPG: P =1.85e-04, STAD: P =2.09e-28) were significantly associated with PD-L1 expression in the above seven types of cancer (Figure S2B). This evidence concerns the gene S100A9 and cancer.