Zhao et al. [99] suggested that M1-like tumor-associated macrophages (TAMs) improved the therapeutic efficacy of PD-L1/programmed cell death protein 1 (PD-1) in gastric cancer via the C-X-C chemokine ligand (CXCL) 9,10,11/CXCR3 signaling pathway. Here, PDCD1 is linked to gastric cancer.