MKI67 and neuroendocrine carcinoma: It could be assumed that a number of tumours in the Nordic NEC Study [4] were well-differentiated with a Ki-67 index >20%, which might explain the cut of point of 55% (Ki-67); meaning that well-differentiated tumours would be in the lower Ki-67 range and increase survival levels, whereas the poorly differentiated NECs would be in the higher range and lower survival levels.