To determine whether decreased NOVA1 expression of immune cells (T cells) in the gastric cancer microenvironment is correlated with T exhaustion or abnormal function of regulatory T cells (Tregs), the density of T cells and FOXP3-positive T cells were counted using the set of gastric cancer tissues (n = 250; Figures 8A–8I). The gene discussed is FOXP3; the disease is gastric cancer.