The ROC curve analysis revealed the following AUC values for GC patients: CD3+ T cells: 0.808 (0.722−0.894), CD4+ T cells: 0.776 (0.681−0.871), CD8+ T cells: 0.783 (0.689−0.876), CD19+ B cells: 0.836 (0.748−0.923), lymphocytes: 0.829 (0.743−0.915), and a combined ROC curve for all factors (CD3+ T, CD4+ T, CD8+ T, lymphocytes, and CD19+ B) with an AUC of 0.828 (0.745−0.912) (Figs. 5A–5F). Here, CD19 is linked to gastric cancer.