MKI67 and cancer: Applying the Ki-67-monocyte ratio for ROC analysis to differentiate between non-neoplastic diseased dogs and dogs with malignant tumours improves the AUC up to a number of 0.74 and values above the cut-off 2.15 indicate a malignant tumour in the organism with a sensitivity of 0.71 and a specificity of 0.62.