CD4 and cancer: We found that the expression level of SLMO2 was positively correlated with the infiltration level of MDSCs in most cancer types (Fig. 7A,B), but not with the infiltration of other immune cell subsets, including B cells, CD4+ T cells, CD8+ T cells, myeloid cells, macrophages, NK cells, Tfh cells, γδ T cells, Tregs, monocytes and neutrophils (Supplementary Fig. S2 and S3).