To further explore the relationship between COX7A1 and immunotherapy in GC patients, we used cibersort deconvolution algorithm to calculate the content of 22 kinds of immune cells in GC patients with TCGA + GSE84437, GSE66229 and GSE26253 data sets, and calculated the correlation between the expression of COX7A1 and the content of these immune cells. The gene discussed is COX7A1; the disease is gastric cancer.