In several cancer immunotherapies, tumor-infiltrating immune cells have been seen as promising markers for revealing the immune responses and tumor control. For examining the diversity of cells and chemicals in the tumor microenvironment (TME), scOmics methods are frequently used. In the meanwhile, scOmics study of immune cells that infiltrate tumors is essential to understanding cell interactions in cancer research. For quantifying several cell types, including T cells, B cells, dendritic cells (DCs), natural killer cells (NKs), macrophages, myeloid-derived suppressor cells (MDSCs), and neutrophils, Single Cell now offers a variety of single-cell omics services.