MKI67 and central nervous system cancer: There was a significant correlation coefficient between the APTw signal intensity and the Ki-67 index (r = 0.597 [0.357 to 0.781 with 95% confidence interval], P < 0.001), and between the ADC value and the Ki-67 index (r = -0.441 [-0.669 to -0.179 with 95% confidence interval], P = 0.003) in the gliomas.