MKI67 and neoplasm: We found significant negative correlations between younger age and size of the primary tumour (r:-0.3, p=0.01), LNM (r:-0.26, p=0.02), diameter of the largest LNM (r:-0.31, p=0.01), ETE (r:-0.3, p=0.01), AI (r:-0.25, p=0.02), labeling index of a proliferation marker Ki67 (LI Ki67) (r:-0.26, p=0.03), psammoma bodies (r:-0.31, p=0.01), fibrosis (r:-0.32, p=0.02) and Bethesda score (r:-0.3, p=0.04).