ZNF521 expression was positively correlated with B-cell infiltration (r = 0.093, P = 0.074), CD8+ T cells (r = 0.232, P = 6.80 × 10−6), CD4+ T cells (r = 0.525, P = 2.49 × 10−27), macrophages (r = 0.651, P = 4.93 × 10−46), neutrophils (r = 0.317, P = 3.93 × 10−10), and DCs (r = 0.456, P = 2.09 × 10−20) in gastric cancer (Figure 3). The gene discussed is CD4; the disease is gastric cancer.