Formalin-fixed or fresh tumor tissues were obtained in all patients for PD-L1 staining; the PD-L1 expression status on infiltrating immune cells (ICs) in the tumor microenvironment was defined by the percentage of PD-L1 positive immune cells: IC0 (<1%), IC1 (≥1% but <5%), and IC2/3 (≥5%). The gene discussed is CD274; the disease is neoplasm.