Tumor proliferation was graded according to Ki-67 positivity as low index [>0 and <10 positive nuclei/10 high power field (HPF)] in 23 of 27 cases (23/27) and as high index (≥10 positive nuclei/10 HPF) in 4 cases (4/27) (Figure 9E). Here, MKI67 is linked to neoplasm.