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AI InsightPalliative resection of primary site in metastatic disease is still controversial.The aim of this study was to find out the influence of resection of primary tumor site on progression-free survival and overall survival inmetastatic non-functioning gastroenteropancreatic neuroendocrine tumors.
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Background/Aims: Gastroenteropancreatic neuroendocrine tumors are rarely seen and have heterogeneous clinical outcomes. Mostlyhalf of the patients had metastatic disease at presentation. Palliative resection of primary site in metastatic disease is still controversial.The aim of this study was to find out the influence of resection of primary tumor site on progression-free survival and overall survival inmetastatic non-functioning gastroenteropancreatic neuroendocrine tumors. The secondary end point is to determine the prognosticfactors influencing the survivals.Materials and Methods: This study was conducted at a single medical oncology center, Antalya Education and Research Hospital. Patients who had non-functioning metastatic gastroenteropancreatic neuroendocrine tumors with primary site resected or unresectedwere compared retrospectively. Resection of metastases was excluded.Results: Fifty-three patients were included in the study and 29 patients had primary tumor resection. The primary site resected grouphad favorable outcomes with the overall survival (median unreached) compared to the median overall survival of 30 months in the unresected group (p=0.001). Median progression-free survival was also better in the primary site resected group than the unresected group(60 months vs. 14 months, respectively) (p=0.013). In multivariate analysis, unresected primary site and high-grade tumors were foundto be independent prognostic factors on low survivals (Hazard ratio (HR): 4.6; 95% CI: 1.21-17.47 and HR: 10.1; 95% CI: 1.15-88.84, respectively). Age (p=0.131), gender (p=0.051), chromogranin A level (p=0.104), Ki-67 index (p=0.550), tumor size (p=0.623), and primarytumor area (p=0.154) did not influence the overall survival.Conclusion: Gastroenteropancreatic neuroendocrine tumors with primary site resected had improved survivals when compared to theunresected group.