MKI67 and urinary bladder neoplasm: Ki-67 labeling indices were approximately 68% (±6.44), 17.13% (±1.21) and 8.23% (±1.36) in bladder tumor T24 xenografts for groups T24 cells alone (Figure 9A, e), T24+hWJMSCs (Figure 9A, f) and T24+hWJMSC-MVs (Figure 9A,g), respectively.