(a) Comparison of somatostatin expression in primary PNETs, nodal metastases, and hepatic metastases from 43 patients by RNA sequencing. (b) Comparison of somatostatin expression between matched primary and hepatic metastases (n = 16) by RNA sequencing from the same cohort of patients as in (a). (c-f) Comparison of gene expression in primary PNETs and hepatic metastases by qPCR in a different validation cohort of 12 patients for somatostatin (c), somatostatin receptor 2 (d), synaptophysin (e), and chromogranin A (f). * p < .05
Abbreviations: lymph node (LN), metastasis (met), pancreatic neuroendocrine tumor (PNET)