MKI67 and neoplasm: Spearman’s correlation analysis showed that all ADC indexes (ADCmin, ADCmean, rADCmin, and rADCmean) were significantly negatively correlated with the Ki-67 proliferation index (ρ =- 0.32 to -0.24, p < 0.05) (Figure 5), suggesting that the lower the ADC value, the higher the proliferative activity of the tumor (Table 4).