NAP1L1, p57Kip2, and menin expression in pancreatic neuroendocrine neoplasms compared to normal pancreatic tissue. NAP1L1 was increased at mRNA level (A) (Kruskal-Wallis p < 0.001) in pNEN primaries (#p < 0.01) and metastases (*p < 0.01) and expression correlated with tumor size (D) (r = 0.42, p < 0.05). In contrast, p57Kip2 mRNA was downregulated in pNEN metastases (B) (*p < 0.01). Menin was not differently expressed in pNEN in comparison to normal tissue in this sample set (C and H). Western blot analysis (E) confirmed elevated NAP1L1 protein levels (F) (*p < 0.05) and downregulated expression of p57Kip2 in pNENs (G) (*p < 0.05). Mean ± SEM.