The abundance of 20 types of immune cells, including B cells, plasma cells, CD4+ T cells, naïve CD4+ T cells, memory CD4+ T cells, TH1 cells, TH2 cells, Treg cells, CD8+ T cells, NK cells, natural killer T (NKT) cells, monocytes, DCs, macrophages, M1 macrophages, M2 macrophages, neutrophils, eosinophils, basophils, and mast cells, in the tumor samples in the high IL-33 group and the low IL-33 group were compared. The gene discussed is CD4; the disease is neoplasm.