The World Health Organization (WHO) classification of Tumours of Endocrine Organs 2017 and WHO Classification of Tumours, Digestive System Tumours, 2019 [1,2] differentiate PanNENs with a well differentiated morphology (PanNETs: pancreatic neuroendocrine tumours) according to Ki67 proliferative index and mitotic count, which might also have impact on patients’ survival [3]. Here, MKI67 is linked to neoplasm.