MKI67 and neoplasm: Compared with those in the Conv-RT subgroup, Ki-67 staining, TUNEL staining, and DNA damage IF of mouse tumor tissues revealed that the UHDR-RT subgroup in the MOC1_R group presented markedly increased DNA damage (by threefold) and apoptosis levels (by fourfold) and decreased tumor proliferative activity (by twofold) (Fig. 2c–g).