Our findings suggested that YAP1 expression is significantly correlated with the tumor purity in 13 cancer types, B cell infiltration in 17 cancer types, CD4+ T cell infiltration in 25 cancer types, CD8+ T cell infiltration in 26 cancer types, macrophage infiltration in 27 cancer types, neutrophil infiltration in 26 cancer types, and DC infiltration in 24 cancer types. The gene discussed is CD4; the disease is cancer.