CD4 and cancer: In addition, ptpn6 expression was significantly correlated with infiltrating levels of B cell in 27 types of cancers, CD8 + T cells in 19 types of cancer, CD4 + T cells in 26 types of cancer, macrophages in 21 types of cancer, neutrophils in 23 types of cancer, and dendritic cells in 29 types of cancer (Table S1).