Ki67

Ki67 antigen is the prototypic cell cycle related nuclear protein, expressed by proliferating cells in all phases of the active cell cycle (G1, S, G2 and M phase). It is absent in resting (G0) cells. Ki67 antibodies are useful in establishing the cell growing fraction in neoplasms. In neoplastic tissues the prognostic value is comparable to the tritiated thymidine-labelling index. The correlation between low Ki67 index and histologically low-grade tumours is strong. Ki67 is routinely used as a neuronal marker of cell cycling and proliferation.