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Perinel J, Nappo G, Zerbi A, Heidsma CM, Nieveen van Dijkum EJM, Han HS, Yoon YS, Satoi S, Demir IE, Friess H, Vashist Y, Izbicki J, Muller AC, Gloor B, Sandini M, Gianotti L, Subtil F, Adham M. Sporadic nonfunctional pancreatic neuroendocrine tumors: Risk of lymph node metastases and aggressiveness according to tumor size: A multicenter international study. Surgery 2022; 172:975-981. [PMID: 35623953 DOI: 10.1016/j.surg.2022.04.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 03/25/2022] [Accepted: 04/06/2022] [Indexed: 01/08/2023]
Abstract
BACKGROUND Although the correlation between tumor size and aggressiveness is clearly established in sporadic nonfunctional pancreatic neuroendocrine tumors, the management of tumors ≤2 cm remains debated. In recent guidelines, the cut-off size to operate ranged from 1 to 2 cm. The aim of this retrospective study was to report the rate of lymph nodes metastases in resected sporadic nonfunctional pancreatic neuroendocrine tumors, according to tumor size and, second, to identify risk factors of lymph node metastases and disease-free survival. METHODS Resected sporadic nonfunctional pancreatic neuroendocrine tumors from 9 international expert centers were included (1999-2017). Functional pancreatic neuroendocrine tumors, genetic syndromes, and R2 resection were excluded. Aggressiveness was defined as microvascular invasion, perineural invasion, lymph node metastases, G3 grading, distant metastases, and/or recurrence. RESULTS Overall, 495 resected sporadic nonfunctional pancreatic neuroendocrine tumors were included. For tumors up to 5 cm, the risk of lymph node metastases was increased by 1.73 for every 1 cm increase in size (odds ratio = 1.73; 95% confidence interval = 1.46-2.03). Tumor size >2 cm (P < .001), perineural invasion (P = .002), microvascular invasion (P < .001), and distant metastases (P = .008) were independently associated with lymph node metastases. Tumor size >2 cm (P = .003), R1 status (P = .004), lymph node metastases (P < .001), and World Health Organization grade 3 (P = .002) were independently associated with disease-free survival. Aggressiveness rate was 13.1% in tumors ≤1 cm and 29% in tumors between 1.1 and 2 cm. CONCLUSION In resected sporadic nonfunctional pancreatic neuroendocrine tumors, the risk of lymph node metastases is correlated to tumor size. Considering that sporadic nonfunctional pancreatic neuroendocrine tumors between 1.1 and 2 cm had a higher risk of lymph node metastases and recurrence compared to tumors ≤1 cm, the decision to perform surgery in this subgroup of patients should be individualized in surgically fit patients.
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Affiliation(s)
- Julie Perinel
- Department of Digestive Surgery, E. Herriot Hospital, Hospices Civils de Lyon, Lyon Sud Faculty of Medicine, UCBL1, Lyon, France.
| | - Gennaro Nappo
- Pancreatic Surgery Unit, Humanitas Clinical and Research Center-IRCCS Rozzano, Milan, Italy
| | - Alessandro Zerbi
- Pancreatic Surgery Unit, Humanitas Clinical and Research Center-IRCCS Rozzano, Milan, Italy; Department of Biomedical Sciences, Humanitas University, Milan, Italy
| | - Charlotte M Heidsma
- Department of Surgery, Amsterdam University Medical Center, University of Amsterdam, The Netherlands
| | | | - Ho Seong Han
- Department of Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Republic of Korea
| | - Yoo-Seok Yoon
- Department of Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Republic of Korea
| | - Sohei Satoi
- Department of Surgery, Kansai Medical University, Osaka, Japan; Division of Surgical Oncology, University of Colorado Anschutz Medical Campus, Aurora, CO
| | - Ihsan Ekin Demir
- Department of Surgery, Technical University Munich Faculty of Medicine, Munchen, Germany
| | - Helmut Friess
- Department of Surgery, Technical University Munich Faculty of Medicine, Munchen, Germany
| | - Yogesh Vashist
- Medias Klinikum, Centre for Surgical Oncology, Burghausen, Germany
| | - Jakob Izbicki
- General, Visceral, and Thoracic Surgery Department, Clinic University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | | | - Beat Gloor
- University Hospital Bern Inselspital Bern, Switzerland
| | - Marta Sandini
- School of Medicine and Surgery, University of Milano-Bicocca and Department of Surgery, San Gerardo Hospital, Monza, Italy
| | - Luca Gianotti
- School of Medicine and Surgery, University of Milano-Bicocca and Department of Surgery, San Gerardo Hospital, Monza, Italy
| | - Fabien Subtil
- UCBLUMR CNRS 5558 - LBBE, Service de Biostatistiques, Hospices Civils de Lyon, France
| | - Mustapha Adham
- Department of Digestive Surgery, E. Herriot Hospital, Hospices Civils de Lyon, Lyon Sud Faculty of Medicine, UCBL1, Lyon, France
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