MKI67 and neoplasm: Figure 5E, F displayed the hematoxylin–eosin (HE) staining results and the expressions of IFI6 and Ki-67 in various groups, more IFI6 and Ki-67 expression was observed in tumor tissues of the RS4;11 + MSCs-LV-IFI6 group compared with the RS4;11, RS4;11 + MSCs and RS4;11 + MSCs-EV groups.