MKI67 and neoplasm: Ki-67 expression was detected in all ectopic tumours, with a median labeling index of 1.3% (maximum 2.5%, minimum 0.5%) for typical carcinoids (n = 5), 3.87% (maximum 16.4%, minimum 0.32%) for atypical carcinoids (n = 13), 25% for a large-cell NE carcinoma, and 18.5% for a NE appendiceal tumour (G2).