For the concordant final cytopathological diagnosis of SPN, a combination of cytomorphological and immunohistochemical findings is widely recommended.26 To differentiate between neuroendocrine tumours, the recently proposed β-catenin, CD10, and PR were used, but not CD99, which is not specific for SPN.19,26 Instead, the CyclinD1, chromogranin and an additional, SOX11 were utilised (Table 1). This evidence concerns the gene SOX11 and neuroendocrine neoplasm.