CD4 and non-small cell lung carcinoma: In NSCLC cases with mutation in KEAP1, the infiltration levels of eight immune-related lymphocytes were lower, except those of common lymphoid progenitor cells and Th2 (T helper 2) CD4 (T-Cell Surface Glycoprotein CD4)+ T cells, which were higher than levels in cases with wild-type KEAP1 (Figure 3B).