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Erschienen in:
01.02.2016 | 2015 SSAT Plenary Presentation
Operative Versus Nonoperative Management of Nonfunctioning Pancreatic Neuroendocrine Tumors
Erschienen in: Journal of Gastrointestinal Surgery | Ausgabe 2/2016
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Introduction
Surgical resection is the only curative treatment for pancreatic neuroendocrine tumors (PNETs), but pancreatic operations carry a significant morbidity. We investigated whether the resection of small, asymptomatic nonfunctioning PNETs is beneficial. Clinicopathologic factors were retrospectively reviewed for all PNET cases from 1998 to 2014.
Methods
Kaplan-Meier survival and multivariable regression analyses were performed. A total of 249 patients had nonfunctioning PNETs with adequate follow-up, of whom 193 were resected and 56 were observed. Median age was 56 years, and 48 % of the patients were female.
Results
Overall, the resected patients had a significantly longer survival (OS) (p = 0.001). However, for the patients with PNETs ≤2.5 cm in size and without metastasis at presentation, tumor size significantly modified the effect of resection on overall survival (p < 0.05). The protective effect of resection increased as tumor size increased. An operation became a significant predictor of overall survival for tumors >1.5 cm (p = 0.050 or less for larger tumors) but was not significant for tumors <1.5 cm (p = 0.317 or more for smaller tumors), controlling for age-adjusted Charlson comorbidity index.
Conclusion
Resection of nonfunctioning PNETs over 1.5 cm is independently and significantly associated with a longer survival. However, the benefit of resection for tumors under 1.5 cm is unclear.