It has been reported that IFN-γ-related gene expression contributes to immunotherapy prediction, such as CCR5, CXCL9, IFNG, STAT1, and PRF1 (Ayers et al., 2017), and these genes are related to tumor antigen presentation, T cytotoxic activity, and immune cell infiltration. Here, CXCL9 is linked to neoplasm.