Abstract
Intro
Chromogranin A (CgA) may be prognostic for patients with neuroendocrine tumors; however, the clinical utility of this test is unclear.
Methods
Patients undergoing resection for pancreatic neuroendocrine tumors (pNET) were selected from the eight institutions of the US Neuroendocrine Tumor Study Group database. Cox regression was used to identify pre-operative variables that predicted recurrence-free survival (RFS), and those with p < 0.1 were included in a risk score. The risk score was tested in a unique subset of the overall cohort.
Results
In the entire cohort of 287 patients, median follow-up time was 37 months, and 5-year RFS was 73%. Cox regression analysis identified four variables for inclusion in the risk score: CgA > 5x ULN (HR 4.3, p = 0.01), tumor grade 2/3 (HR 3.7, p = 0.01), resection for recurrent disease (HR 6.2, p < 0.01), and tumor size > 4 cm (HR 4.5, p = 0.1). Each variable was assigned 1 point. Risk-score testing in the unique validation cohort of 63 patients revealed a 95% negative predictive value for recurrence in patients with zero points.
Discussion
This simple pre-operative risk scoring system resulted in a high degree of specificity for identifying patients at low-risk for tumor recurrence. This test can be utilized pre-operatively to aid informed decision-making.
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Acknowledgements
SMW and DEA are supported with the resources and use of facilities at the William S. Middleton Memorial Veterans Hospital, Madison, WI.
Funding
AVF’s position as a research fellow is supported by NIH Surgical Oncology Training Grant (T32 CA090217), and an American College of Surgeons Resident Research Scholarship.
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This work was accepted for plenary oral presentation on June 3, 2018, at the Society for Surgery of the Alimentary Tract Annual Meeting in Washington, D.C.
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Fisher, A.V., Lopez-Aguiar, A.G., Rendell, V.R. et al. Predictive Value of Chromogranin A and a Pre-Operative Risk Score to Predict Recurrence After Resection of Pancreatic Neuroendocrine Tumors. J Gastrointest Surg 23, 651–658 (2019). https://doi.org/10.1007/s11605-018-04080-1
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DOI: https://doi.org/10.1007/s11605-018-04080-1