MKI67 and neoplasm: After percent agreement calculation, a moderate level of agreement between well-differentiated tumours (grade I) and low Ki-67 index (<14%) was observed when using EE and Mills-2015 grading systems, as seven out of 12 (58%), and four out of six (66.7%) cases graded as I (EE and Mills-2015, respectively) had low Ki-67 indexes.