MKI67 and breast cancer: When we analyzed the ability of the peritumor/tumor ADC ratios to predict the final histopathological parameters of breast cancers, the peritumor/tumor ADC ratios best differentiated between tumors with or without axillary lymph node metastasis (LR+ = 4.57), while they played little role in differentiating between high and low Ki-67 expression (LR+ = 1.64).