In addition, certain molecular markers expressed in common tumor cells, such as epidermal growth factor receptor variant III (EGFRvIII), chondroitin sulphate proteoglycan 4 (CSPG4), human epidermal growth factor receptor 2(HER2), NKG2D ligands (NKG2DLs), etc., are also expressed on the surface of tumor stem cells[110]. The gene discussed is KLRK1; the disease is neoplasm.