MKI67 and neoplasm: Tumorigenesis in vivo demonstrated that monoclonal antibody against PD-L1 attenuated the tumorigenesis of murine OC ID8 cells, whereas the addition of aspirin significantly enhanced the inhibitory effect of antiPD-L1 antibody, manifested by decreased tumor growth, tumor weight, and expression of Ki-67 and PD-L1 (Figures 6(a)–6(d)).