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Pancreatic Neuroendocrine Neoplasms Larger than 4 cm: A Retrospective Observational Study of Surgery, Histology, and Outcome. J Clin Med 2023; 12:jcm12051840. [PMID: 36902627 PMCID: PMC10003654 DOI: 10.3390/jcm12051840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Revised: 02/20/2023] [Accepted: 02/23/2023] [Indexed: 03/02/2023] Open
Abstract
BACKGROUND Pancreatic neuroendocrine neoplasms (pNENs) are often detected as large primary lesions, even with distant metastases, and their prognosis may be difficult to predict. METHODS In this retrospective study, we retrieved data of patients treated for a large pNEN in our Surgical Unit (1979-2017) to evaluate the possible prognostic role of clinic-pathological features and surgery. Cox-proportional hazard regression models were used to find possible associations among some variables (clinical features, surgery, and histology) and survival at univariate and multivariate analyses. RESULTS Among 333 pNENs, we identified 64 patients (19%) with a lesion > 4 cm. Patients' median age was 61 years, median tumor size was 6.0 cm, and 35 (55%) patients had distant metastases at diagnosis. There were 50 (78%) nonfunctioning pNENs, and 31 tumors localized in the body/tail region of the pancreas. Overall, 36 patients underwent a standard pancreatic resection (with 13 associated liver resection/ablation). Regarding histology, 67% of pNENs were N1, and 34% were grade 2. After a median follow-up of 48 months (up to 33 years), 42 patients died of disease. Median survival after surgery was 79 months, and six patients experienced recurrence (median DFS 94 months). At multivariate analysis, distant metastases were associated with a worse outcome, while having undergone radical tumor resection was a protective factor. CONCLUSIONS In our experience, about 20% of pNENs have a size > 4 cm, 78% are nonfunctioning, and 55% show distant metastases at diagnosis. Nevertheless, a long-term survival of more than five years may be achieved after surgery.
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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: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [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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Takikawa T, Kikuta K, Hamada S, Kume K, Miura S, Yoshida N, Tanaka Y, Matsumoto R, Ikeda M, Kataoka F, Sasaki A, Hayashi H, Hatta W, Ogata Y, Nakagawa K, Unno M, Masamune A. A New Preoperative Scoring System for Predicting Aggressiveness of Non-Functioning Pancreatic Neuroendocrine Neoplasms. Diagnostics (Basel) 2022; 12:diagnostics12020397. [PMID: 35204488 PMCID: PMC8870938 DOI: 10.3390/diagnostics12020397] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 02/01/2022] [Accepted: 02/01/2022] [Indexed: 12/04/2022] Open
Abstract
The management of non-functioning pancreatic neuroendocrine neoplasms (NF-PanNENs) is still controversial. This study aimed to develop a new scoring system for treatment decisions at initial diagnosis based on the identification of the predictive factors for aggressive NF-PanNENs. Seventy-seven patients who had been pathologically diagnosed with NF-PanNENs were enrolled. We retrospectively reviewed 13 variables that could be assessed preoperatively. Univariate and multivariate stepwise logistic regression analyses were performed to identify factors for the aggressiveness of NF-PanNENs, and a scoring system was developed by assigning weighted points proportional to their β regression coefficient. Tumor size > 20 mm on contrast-enhanced computed tomography, tumor non-vascularity, and Ki-67 labeling index ≥5% on endoscopic ultrasound-guided fine-needle aspiration specimens were identified as independent factors for predicting the aggressiveness of NF-PanNENs. The new scoring system, developed using the identified factors, had an excellent discrimination ability, with area under the curve of 0.92 (95% CI, 0.85–0.99), and good calibration (p = 0.72, Hosmer-Lemeshow test). Ten-year overall survival rates in low-risk (0 point), intermediate-risk (1 to 2 points), and high-risk (3 to 4 points) groups were 100%, 90.9%, and 24.3%, respectively. This new scoring system would be useful for treatment decisions and prognostic prediction at initial diagnosis.
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Affiliation(s)
- Tetsuya Takikawa
- Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan; (T.T.); (K.K.); (S.H.); (K.K.); (S.M.); (N.Y.); (Y.T.); (R.M.); (M.I.); (F.K.); (A.S.); (H.H.); (W.H.); (Y.O.)
| | - Kazuhiro Kikuta
- Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan; (T.T.); (K.K.); (S.H.); (K.K.); (S.M.); (N.Y.); (Y.T.); (R.M.); (M.I.); (F.K.); (A.S.); (H.H.); (W.H.); (Y.O.)
| | - Shin Hamada
- Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan; (T.T.); (K.K.); (S.H.); (K.K.); (S.M.); (N.Y.); (Y.T.); (R.M.); (M.I.); (F.K.); (A.S.); (H.H.); (W.H.); (Y.O.)
| | - Kiyoshi Kume
- Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan; (T.T.); (K.K.); (S.H.); (K.K.); (S.M.); (N.Y.); (Y.T.); (R.M.); (M.I.); (F.K.); (A.S.); (H.H.); (W.H.); (Y.O.)
| | - Shin Miura
- Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan; (T.T.); (K.K.); (S.H.); (K.K.); (S.M.); (N.Y.); (Y.T.); (R.M.); (M.I.); (F.K.); (A.S.); (H.H.); (W.H.); (Y.O.)
| | - Naoki Yoshida
- Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan; (T.T.); (K.K.); (S.H.); (K.K.); (S.M.); (N.Y.); (Y.T.); (R.M.); (M.I.); (F.K.); (A.S.); (H.H.); (W.H.); (Y.O.)
| | - Yu Tanaka
- Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan; (T.T.); (K.K.); (S.H.); (K.K.); (S.M.); (N.Y.); (Y.T.); (R.M.); (M.I.); (F.K.); (A.S.); (H.H.); (W.H.); (Y.O.)
| | - Ryotaro Matsumoto
- Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan; (T.T.); (K.K.); (S.H.); (K.K.); (S.M.); (N.Y.); (Y.T.); (R.M.); (M.I.); (F.K.); (A.S.); (H.H.); (W.H.); (Y.O.)
| | - Mio Ikeda
- Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan; (T.T.); (K.K.); (S.H.); (K.K.); (S.M.); (N.Y.); (Y.T.); (R.M.); (M.I.); (F.K.); (A.S.); (H.H.); (W.H.); (Y.O.)
| | - Fumiya Kataoka
- Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan; (T.T.); (K.K.); (S.H.); (K.K.); (S.M.); (N.Y.); (Y.T.); (R.M.); (M.I.); (F.K.); (A.S.); (H.H.); (W.H.); (Y.O.)
| | - Akira Sasaki
- Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan; (T.T.); (K.K.); (S.H.); (K.K.); (S.M.); (N.Y.); (Y.T.); (R.M.); (M.I.); (F.K.); (A.S.); (H.H.); (W.H.); (Y.O.)
| | - Hidehiro Hayashi
- Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan; (T.T.); (K.K.); (S.H.); (K.K.); (S.M.); (N.Y.); (Y.T.); (R.M.); (M.I.); (F.K.); (A.S.); (H.H.); (W.H.); (Y.O.)
| | - Waku Hatta
- Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan; (T.T.); (K.K.); (S.H.); (K.K.); (S.M.); (N.Y.); (Y.T.); (R.M.); (M.I.); (F.K.); (A.S.); (H.H.); (W.H.); (Y.O.)
| | - Yohei Ogata
- Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan; (T.T.); (K.K.); (S.H.); (K.K.); (S.M.); (N.Y.); (Y.T.); (R.M.); (M.I.); (F.K.); (A.S.); (H.H.); (W.H.); (Y.O.)
| | - Kei Nakagawa
- Department of Surgery, Graduate School of Medicine, Tohoku University, Sendai 980-8574, Japan; (K.N.); (M.U.)
| | - Michiaki Unno
- Department of Surgery, Graduate School of Medicine, Tohoku University, Sendai 980-8574, Japan; (K.N.); (M.U.)
| | - Atsushi Masamune
- Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan; (T.T.); (K.K.); (S.H.); (K.K.); (S.M.); (N.Y.); (Y.T.); (R.M.); (M.I.); (F.K.); (A.S.); (H.H.); (W.H.); (Y.O.)
- Correspondence: ; Tel.:+81-22-717-7171; Fax: +81-22-717-7177
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Zhu J, Fu C, Zhang Y, Zhou X, Xiao W, Li Y. Observation Versus Resection for Small, Localized, and Nonfunctional Pancreatic Neuroendocrine Tumors: A Propensity Score Matching Study. Pancreas 2022; 51:56-62. [PMID: 35195596 DOI: 10.1097/mpa.0000000000001959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
OBJECTIVES The best treatment modalities for small (1-2 cm), localized, and nonfunctional pancreatic neuroendocrine tumors remain controversial. Therefore, we aimed to evaluate whether surgical resection provides survival benefit over observation in those patients. METHODS From 1973 to 2015, all eligible patients were retrieved from the Surveillance, Epidemiology, and End Results database. Propensity score matching (1:2) method was performed. The primary endpoints evaluated were overall survival (OS) and cancer-specific survival (CSS). RESULTS We identified 681 patients, of which 122 and 559 patients received observation and resection, respectively. Propensity score-matched patients who underwent surgery (n = 183) had significantly improved OS (P = 0.008) compared with matched patients who underwent observation (n = 106), but there was no difference in CSS (P = 0.310). On multivariate analysis, resection could improve OS but not CSS. Besides, poorly differentiated/undifferentiated tumor had a worse OS and CSS. Subgroup analysis showed that patients 60 years and older who underwent resection could achieve a longer OS and CSS. CONCLUSIONS This disease exhibits a very good prognosis. Patients undergoing resection were associated with comparable 5-year CSS but longer 5-year OS compared with those receiving observation. Elderly patients (≥60) may obtain benefit from surgery, whereas the treatment of younger patients should be individualized.
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Affiliation(s)
- Jisheng Zhu
- From the Department of General Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, China
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Ricci C, Partelli S, Landoni L, Rinzivillo M, Ingaldi C, Andreasi V, Nessi C, Muffatti F, Fontana M, Tamburrino D, Deiro G, Alberici L, Campana D, Panzuto F, Bassi C, Falconi M, Casadei R. Sporadic non-functioning pancreatic neuroendocrine tumours: multicentre analysis. Br J Surg 2021; 108:811-816. [PMID: 33724300 DOI: 10.1093/bjs/znaa141] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 10/05/2020] [Accepted: 11/24/2020] [Indexed: 12/20/2022]
Abstract
BACKGROUND Outcomes after surgery for sporadic pancreatic neuroendocrine neoplasms (Pan-NENs) were evaluated. METHODS This multicentre study included patients who underwent radical pancreatic resection for sporadic non-functioning Pan-NENs. In survival analysis, the risk of mortality in this cohort was analysed in relation to that of the matched healthy Italian population. Relative survival (RS) was calculated as the rate between observed and expected survival. Factors related to RS were investigated using multivariable modelling. RESULTS Among 964 patients who had pancreatic resection for sporadic non-functioning Pan-NENs, the overall RS rate was 91.8 (95 per cent c.i. 81.5 to 96.5) per cent. 2019 WHO grade (hazard ratio (HR) 5.75 (s.e. 4.63); P = 0.030) and European Neuroendocrine Tumour Society (ENETS) TNM stage (6.73 (3.61); P < 0.001) were independent predictors of RS. The probability of a normal lifespan for patients with G1, G2, G3 Pan-NENS, and pancreatic neuroendocrine carcinomas (Pan-NECs) was 96.7, 54.8, 0, and 0 per cent respectively. The probability of a normal lifespan was 99.8, 99.3, 79.8, and 46.8 per cent for those with stage I, II, III, and IV disease respectively. The overall disease-free RS rate was 73.6 (65.2 to 79.5) per cent. 2019 WHO grade (HR 2.10 (0.19); P < 0.001) and ENETS TNM stage (HR 2.50 (0.24); P < 0.001) significantly influenced disease-free RS. The probability of disease-free survival was 93.2, 84.9, 45.2, and 6.8 per cent for patients with stage I, II, III, and IV disease, and 91.9, 45.2, 9.4, and 0.7 per cent for those with G1, G2, G3 Pan-NENS, and Pan-NECs, respectively. CONCLUSION A surgical approach seems without benefit for Pan-NECs, and unnecessary for small G1 sporadic Pan-NENs. Surgery alone may be insufficient for stage III-IV and G3 Pan-NENs.
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Affiliation(s)
- C Ricci
- Division of Pancreatic Surgery, Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.,Department of Internal Medicine and Surgery; Alma Mater Studiorum, University of Bologna, Bologna, Italy
| | - S Partelli
- Pancreatic Surgery Unit, Pancreas Translational and Clinical Research Centre, San Raffaele Scientific Institute, Milan, Italy.,'Vita-Salute' San Raffaele University, Milan, Italy
| | - L Landoni
- General and Pancreatic Surgery Department, Pancreas Institute-University of Verona Hospital Trust, Verona, Italy
| | - M Rinzivillo
- Digestive Disease Unit, ENETS Center of Excellence, Sant'Andrea University Hospital, Rome, Italy
| | - C Ingaldi
- Division of Pancreatic Surgery, Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.,Department of Internal Medicine and Surgery; Alma Mater Studiorum, University of Bologna, Bologna, Italy
| | - V Andreasi
- Pancreatic Surgery Unit, Pancreas Translational and Clinical Research Centre, San Raffaele Scientific Institute, Milan, Italy.,'Vita-Salute' San Raffaele University, Milan, Italy
| | - C Nessi
- General and Pancreatic Surgery Department, Pancreas Institute-University of Verona Hospital Trust, Verona, Italy
| | - F Muffatti
- Pancreatic Surgery Unit, Pancreas Translational and Clinical Research Centre, San Raffaele Scientific Institute, Milan, Italy.,'Vita-Salute' San Raffaele University, Milan, Italy
| | - M Fontana
- General and Pancreatic Surgery Department, Pancreas Institute-University of Verona Hospital Trust, Verona, Italy
| | - D Tamburrino
- Pancreatic Surgery Unit, Pancreas Translational and Clinical Research Centre, San Raffaele Scientific Institute, Milan, Italy
| | - G Deiro
- General and Pancreatic Surgery Department, Pancreas Institute-University of Verona Hospital Trust, Verona, Italy
| | - L Alberici
- Division of Pancreatic Surgery, Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.,Department of Internal Medicine and Surgery; Alma Mater Studiorum, University of Bologna, Bologna, Italy
| | - D Campana
- Division of Pancreatic Surgery, Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.,Division of Oncology, Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - F Panzuto
- Digestive Disease Unit, ENETS Center of Excellence, Sant'Andrea University Hospital, Rome, Italy
| | - C Bassi
- General and Pancreatic Surgery Department, Pancreas Institute-University of Verona Hospital Trust, Verona, Italy
| | - M Falconi
- Pancreatic Surgery Unit, Pancreas Translational and Clinical Research Centre, San Raffaele Scientific Institute, Milan, Italy.,'Vita-Salute' San Raffaele University, Milan, Italy
| | - R Casadei
- Division of Pancreatic Surgery, Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.,Department of Internal Medicine and Surgery; Alma Mater Studiorum, University of Bologna, Bologna, Italy
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Kriger AG, Berelavichus SV, Kaldarov AR, Gorin DS, Raevskaya MB, Kazennov VV, Zekster VY, Panteleev VI. Organ‐preserving procedures as an option for treatment of patients with pancreatic neuroendocrine tumours. SURGICAL PRACTICE 2021. [DOI: 10.1111/1744-1633.12473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andrey G. Kriger
- Abdominal Surgery Department, Anesthesiology and Intensive Care Department A.V. Vishnevsky Centre of Surgery, Ministry of Health, Russia Moscow Russian Federation
| | - Stanislav V. Berelavichus
- Abdominal Surgery Department, Anesthesiology and Intensive Care Department A.V. Vishnevsky Centre of Surgery, Ministry of Health, Russia Moscow Russian Federation
| | - Ayrat R. Kaldarov
- Abdominal Surgery Department, Anesthesiology and Intensive Care Department A.V. Vishnevsky Centre of Surgery, Ministry of Health, Russia Moscow Russian Federation
| | - David S. Gorin
- Abdominal Surgery Department, Anesthesiology and Intensive Care Department A.V. Vishnevsky Centre of Surgery, Ministry of Health, Russia Moscow Russian Federation
| | - Marianna B. Raevskaya
- Abdominal Surgery Department, Anesthesiology and Intensive Care Department A.V. Vishnevsky Centre of Surgery, Ministry of Health, Russia Moscow Russian Federation
| | - Vladimir V. Kazennov
- Abdominal Surgery Department, Anesthesiology and Intensive Care Department A.V. Vishnevsky Centre of Surgery, Ministry of Health, Russia Moscow Russian Federation
| | - Vita Y. Zekster
- Therapy department I.M. Sechenov First Medical State University, Ministry of Health, Russia Moscow Russian Federation
| | - Vladimir I. Panteleev
- Abdominal Surgery Department, Anesthesiology and Intensive Care Department A.V. Vishnevsky Centre of Surgery, Ministry of Health, Russia Moscow Russian Federation
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Sun Y, Wang Y, Li R, Kang G, Zhang M, Chen X, Jin M, Liu Y, He Y, Zhu X, Kang Q, Zhou F, Yu Q. Surgical resection of primary tumor is associated with prolonged survival in low-grade pancreatic neuroendocrine tumors. Clin Res Hepatol Gastroenterol 2021; 45:101432. [PMID: 32386797 DOI: 10.1016/j.clinre.2020.04.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 04/02/2020] [Accepted: 04/09/2020] [Indexed: 02/04/2023]
Abstract
INTRODUCTION The incidence of pancreatic neuroendocrine tumors (PNETs) is increasing over the past few decades. Surgery for low-grade and small PNETs of less than 2cm and N0M0 is still debated. The purpose of this study is to examine the association between surgical resection and survival in patients with low-grade nonfunctioning PNETs. MATERIALS AND METHODS Patients diagnosed with PNETs between 2004 and 2015 were extracted from SEER. Kaplan-Meier methods and Cox proportional hazard models were used to estimate independent predictors in PNETs patients. RESULTS A total of 2637 patients (2147 underwent surgical resection and 490 did not undergo surgery) with histologically confirmed low-grade PNETs in this cohort study. Overall survival (OS) and cancer-specific survival (CSS) of patients with surgery was better than those without surgery (log rank test POS<0.001, PCSS<0.001). Multivariate Cox regression analysis showed that surgical status was an independent prognostic factor associated with OS (HR 3.257, 95%CI: 2.635, 4.026) and CSS (HR 3.546, 95%CI: 2.798, 4.493). Subgroup analysis suggested the patients receiving surgery apparently had better OS and CSS regardless of tumor size (all log rank test POS<0.001, all log rank test PCSS<0.001) and SEER stage (all log rank test POS<0.001, all log rank test PCSS<0.001), compared to patients without removal of the primary tumor. CONCLUSIONS Surgical resection of primary tumor may have a significant benefit on survival for patients with low-grade nonfunctioning PNETs. To determine the optimal management, grade, stage and tumor size should be considered comprehensively.
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Affiliation(s)
- Yaoyao Sun
- Cancer System Biology Center, China-Japan Union Hospital, Jilin University, China; Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, China
| | - Yueying Wang
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, China
| | - Rixin Li
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, China
| | - Guojun Kang
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, China
| | - Mingyuan Zhang
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, China
| | - Xin Chen
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, China
| | - Mengdi Jin
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, China
| | - Yang Liu
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, China
| | - Yang He
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, China
| | - Xiaojing Zhu
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, China
| | - Qi Kang
- Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, China
| | - Fengfeng Zhou
- Cancer System Biology Center, China-Japan Union Hospital, Jilin University, China
| | - Qiong Yu
- Cancer System Biology Center, China-Japan Union Hospital, Jilin University, China; Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, China.
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Liu X, Chin W, Pan C, Zhang W, Yu J, Zheng S, Liu Y. Risk of malignancy and prognosis of sporadic resected small (≤2 cm) nonfunctional pancreatic neuroendocrine tumors. Gland Surg 2021; 10:219-232. [PMID: 33633978 DOI: 10.21037/gs-20-582] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Background Small nonfunctional pancreatic neuroendocrine tumors (NF-PNETs) ≤2 cm have variable biological features, and there is no gold standard treatment for their management. The present study aimed to evaluate the risk of malignancy of small NF-PNETs and their outcomes following curative resection. Methods Patients with NF-PNETs undergoing surgical resection at the First Affiliated Hospital, College of Medicine, Zhejiang University, between 2012 and 2017 were included. Clinicopathological characteristics, perioperative results, and prognosis were retrospectively analyzed. Results A total of 73 patients were identified, including 28 with small NF-PNETs and 45 large PNETs; 32.1% of NF-PNETs ≤2 cm underwent a parenchyma-sparing pancreas surgery, which was >6.7% in large NF-PNETs. No statistically significant differences in perioperative results, postoperative complications, and long-term outcomes were found between small tumors undergoing standard and parenchyma-sparing pancreatectomy. Eighteen small tumors (64.3%) developed a perioperative complication, with a clinically significant pancreatic fistula rate of 25%; however, only 2 patient needed reintervention. Small NF-PNETs in 3 patients were malignant. Multivariate logistic regression showed that grade ≥3 and lymphovascular invasion were independently related to malignancy in NF-PNETs. Conclusions Small NF-PNETs (≤2 cm) are not immune from potential malignancy. Surgical resection may be considered for small tumors and can provide favorable postoperative and long-term outcomes. Parenchyma-sparing pancreatectomy may be an alternative surgery for selected small local NF-PNETs.
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Affiliation(s)
- Xi Liu
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China.,NHC Key Laboratory of Combined Multi-organ Transplantation, Hangzhou, China
| | - Wenjie Chin
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China.,NHC Key Laboratory of Combined Multi-organ Transplantation, Hangzhou, China
| | - Chenggeng Pan
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Weichen Zhang
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China.,NHC Key Laboratory of Combined Multi-organ Transplantation, Hangzhou, China
| | - Jun Yu
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China.,NHC Key Laboratory of Combined Multi-organ Transplantation, Hangzhou, China
| | - Shusen Zheng
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China.,NHC Key Laboratory of Combined Multi-organ Transplantation, Hangzhou, China
| | - Yuanxing Liu
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China.,NHC Key Laboratory of Combined Multi-organ Transplantation, Hangzhou, China
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9
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Tanaka M, Heckler M, Mihaljevic AL, Probst P, Klaiber U, Heger U, Schimmack S, Büchler MW, Hackert T. Systematic Review and Metaanalysis of Lymph Node Metastases of Resected Pancreatic Neuroendocrine Tumors. Ann Surg Oncol 2020; 28:1614-1624. [PMID: 32720049 DOI: 10.1245/s10434-020-08850-7] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Accepted: 06/27/2020] [Indexed: 12/15/2022]
Abstract
BACKGROUND The optimal surgical strategy for pancreatic neuroendocrine tumors (PNETs) is unknown. However, current guidelines recommend a watch-and-wait strategy for small nonfunctional PNETs (NF-PNETs). The aim of this study is to investigate the risk stratification and prognostic significance of lymph node metastasis (LNM) of PNETs to guide decision-making for lymphadenectomy. PATIENTS AND METHODS The MEDLINE and Web of Science databases were systematically searched for studies reporting either risk factors of LNM in resected PNETs or survival of patients with LNM. The weighted average incidence of LNM was calculated according to tumor characteristics. Random-effects metaanalyses were performed, and pooled hazard ratios (HR) and their 95% confidence intervals (CI) were calculated to determine the impact of LNM on overall survival (OS). In subgroup analyses, NF-PNETs were assessed. RESULTS From a total of 5883 articles, 98 retrospective studies with 13,374 patients undergoing resection for PNET were included. In all PNETs, the weighted median rates of LNM were 11.5% for small (≤ 2 cm) PNETs and 15.8% for G1 PNETs. In NF-PNETs, the rates were 11.2% for small PNETs and 10.3% for G1 PNETs. LNM of all PNETs (HR 3.87, 95% CI 3.00-4.99, P < 0.001) and NF-PNETs (HR 4.98, 95% CI 2.81-8.83, P < 0.001) was associated with worse OS. CONCLUSIONS LNM is potentially prevalent even in small and well-differentiated PNETs and is associated with worse prognosis. A watch-and-wait strategy for small NF-PNETs should be reappraised, and oncologic resection with lymphadenectomy can be considered. Prospective and controlled studies are needed in the future.
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Affiliation(s)
- Masayuki Tanaka
- Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Heidelberg, Germany.,Department of Surgery, Keio University, School of Medicine, Tokyo, Japan
| | - Max Heckler
- Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Heidelberg, Germany
| | - André L Mihaljevic
- Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Heidelberg, Germany
| | - Pascal Probst
- Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Heidelberg, Germany
| | - Ulla Klaiber
- Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Heidelberg, Germany
| | - Ulrike Heger
- Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Heidelberg, Germany
| | - Simon Schimmack
- Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Heidelberg, Germany
| | - Markus W Büchler
- Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Heidelberg, Germany
| | - Thilo Hackert
- Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Heidelberg, Germany.
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10
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What is the Outcome of Patients Affected by Intraductal Papillary Mucinous Neoplasms Without High-Risk Stigmata?: A Single-Center Retrospective Study. Pancreas 2019; 48:1167-1174. [PMID: 31593009 DOI: 10.1097/mpa.0000000000001388] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
OBJECTIVES The objectives of the study were to define the natural history of intraductal papillary mucinous neoplasms (IPMNs) without high-risk stigmata (HRS) and to identify factors capable of influencing outcome and management. METHODS This is a retrospective study of patients affected by IPMNs without HRS. Survival analyses included overall survival, disease-specific survival, and years of life lost. Uni- and multivariate analyses were carried out to identify factors capable of predicting years of life lost. RESULTS Three hundred fifty-six patients were analyzed. Fifty-three patients (14.9%) died: no postoperative mortality, 6 (1.7%) patients from pancreatic cancer and 47 (13.2%) from reasons not related to the disease. Mean overall survival and disease-specific survival were 199.4 (SD, 16.6) and 281 months (SD, 6.9), respectively. The years of life lost of the sample observed with respect to the general population were 2 years and 3 months (15 years and 3 months vs 17 years and 6 months). Younger age, length of follow-up more than 3 years, and surgery significantly increased the years of life lost. CONCLUSIONS The patients affected by IPMNs without HRS rarely died from the disease. Young age (<65 years) and follow-up more than 3 years seemed to be the only factors capable of influencing the outcome and management.
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11
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Gaujoux S. On the origin of "indolent" and "aggressive" non-functioning pancreatic neuroendocrine tumour: genetically unrelated or close relative? Dig Liver Dis 2019; 51:741-742. [PMID: 30857826 DOI: 10.1016/j.dld.2019.02.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 02/07/2019] [Accepted: 02/11/2019] [Indexed: 12/11/2022]
Affiliation(s)
- Sébastien Gaujoux
- Hôpital Cochin, Department of Hepato-Pancreato-Biliary and Endocrine Surgery, AP-HP, Paris, France; Université Paris Descartes, Paris, France.
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12
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Larghi A, Rizzatti G, Rimbaş M, Crino SF, Gasbarrini A, Costamagna G. EUS-guided radiofrequency ablation as an alternative to surgery for pancreatic neuroendocrine neoplasms: Who should we treat? Endosc Ultrasound 2019; 8:220-226. [PMID: 31249164 PMCID: PMC6714479 DOI: 10.4103/eus.eus_28_19] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Pancreatic neuroendocrine neoplasms (PanNENs) are rare tumors, but their incidental diagnosis has significantly increased due to the widespread use of imaging studies. Therefore, most PanNENs are now diagnosed when completely asymptomatic and in early stages. PanNENs are classified according to their grade (Ki-67 index) and can be functional (F-) or nonfunctional (NF-) depending on the presence or absence of a clinical, hormonal hypersecretion syndrome. The mainstay treatment of PanNENs is a surgery that is mostly curative but also associated with significant short- and long-term adverse events. Therefore, less invasive alternative locoregional treatment modalities are warranted. Recently, few case reports and two case series have described EUS-guided radiofrequency ablation (EUS-RFA) for the treatment of patients with both F-PanNENs and NF-PanNENs. If for F-PanNENs EUS-RFA can very easily become the standard of care, for NF-PanNENEs it is still controversial how to select patients for EUS-RFA. A balance between overtreatment (i.e., RFA/surgery in patients who will not progress) and undertreatment (locoregional treatments in patients with undetected metastases) needs to be found based on solid data. The decision should also take into account patients’ comorbidity and risk of postoperative death, life expectancy, tumor location, risk of postoperative fistula and postoperative morbidity, and risk of long-term exocrine and/or endocrine insufficiency. To answer the important question on which a patient should be treated with EUS-RFA, properly designed studies to evaluate the efficacy of this treatment in large cohorts of patients with NF-PanNENs and to establish prognostic factors associated with treatment response are urgently needed.
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Affiliation(s)
- Alberto Larghi
- Digestive Endoscopy Unit, Foundation University Policlinico Hospital A. Gemelli, IRCCS, Catholic University, Rome, Italy
| | - Gianenrico Rizzatti
- Digestive Endoscopy Unit; Division of Gastroenterology, Foundation University Policlinico Hospital A. Gemelli, IRCCS, Catholic University, Rome, Italy
| | - Mihai Rimbaş
- Digestive Endoscopy Unit, Foundation University Policlinico Hospital A. Gemelli, IRCCS, Catholic University, Rome, Italy; Department of Gastroenterology, Colentina Clinical Hospital, Carol Davila University of Medicine, Bucharest, Romania
| | - Stefano Francesco Crino
- Gastroenterology and Digestive Endoscopy Unit, Pancreas Institute, University Hospital of Verona, Verona, Italy
| | - Antonio Gasbarrini
- Division of Gastroenterology, Foundation University Policlinico Hospital A. Gemelli, IRCCS, Catholic University, Rome, Italy
| | - Guido Costamagna
- Digestive Endoscopy Unit, Foundation University Policlinico Hospital A. Gemelli, IRCCS, Catholic University, Rome, Italy; IHU-USIAS, University of Strasbourg, Strasbourg, France
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13
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Ki-67 and presence of liver metastases identify different progression-risk classes in pancreatic neuroendocrine neoplasms (pNEN) undergoing resection. Eur J Surg Oncol 2018; 45:755-760. [PMID: 30366875 DOI: 10.1016/j.ejso.2018.10.052] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Revised: 09/12/2018] [Accepted: 10/06/2018] [Indexed: 12/20/2022] Open
Abstract
In pancreatic neuroendocrine neoplasms (pNEN), size ≤2 cm and Ki-67 < 3% suggest indolent behavior, but no factor alone predicts prognosis. We investigated factors predictive of tumor progression in 80 pNENs surgically resected in a single Institution from 1995 to 2015. At multivariable analysis the only two independent variables related to PFS were Ki-67 (HR 2.97; 95%CI 1.26-7.02) and presence of synchronous liver metastases (HR 3.60; 95%CI 1.70-7.61). Using Ki-67 < 3% and M0 as reference, the HR for tumor progression was 3.21 (95%CI 1.18-8.74) for M0 patients with Ki-67 3-20%, 5.06 (2.29-11.2) for M1 patients with Ki-67 ≤ 20% and 24.3 (6.64-89.2) for those with Ki-67 > 20%. Tumor size (≤2 vs. >2 cm) was not a predictive factor at any analysis. Intra-class correlation of Ki-67 values on pre-surgical biopsies vs. surgical specimens was 0.99 and Ki-67 classes were correctly identified in 97% of biopsies. Ki-67 and presence of liver metastases are the major prognostic factors in pNEN and identify different progression risks regardless of tumor size. Pre-surgical pNEN biopsy for Ki-67 assessment should be included in the evaluation of patients with 1-2 cm tumors to help in the decision on whether to perform surgical resection.
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14
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Genc CG, Klümpen HJ, van Oijen MGH, van Eijck CHJ, Nieveen van Dijkum EJM. A Nationwide Population-Based Study on the Survival of Patients with Pancreatic Neuroendocrine Tumors in The Netherlands. World J Surg 2018; 42:490-497. [PMID: 29018912 PMCID: PMC5762791 DOI: 10.1007/s00268-017-4278-y] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Background Large population-based studies give insight into the prognosis and treatment outcomes of patients with pancreatic neuroendocrine tumors (pNETs). Therefore, we provide an overview of the treatment and related survival of pNET in the Netherlands. Methods Patients diagnosed with pNET between 2008 and 2013 from the Netherlands Cancer Registry were included. Patient, tumors and treatment characteristics were reported. Survival analyses with log-rank testing were performed to compare survival. Results In total, 611 patients were included. Median follow-up was 25.7 months, and all-cause mortality was 42%. Higher tumor grade and TNM stage were significantly associated with worse survival in both the overall and metastasized population. The effect of distant metastases on survival was more significant in lower tumor stages (T1–3 p < 0.05, T4 p = 0.074). Resection of the primary tumor was performed in 255 (42%) patients. Patients who underwent surgery had the highest 5-year survival (86%) compared to PRRT (33%), chemotherapy (21%), targeted therapy and somatostatin analogs (24%) (all p < 0.001). Patients with T1M0 tumors (n = 115) showed favorable survival after surgical resection (N = 95) compared to no therapy (N = 20, p = 0.008). Resection also improved survival significantly in patients with metastases compared to other treatments (all p > 0.05). Without surgery, PRRT showed the best survival curves in patients with distant metastases. Grade 3 tumors and surgical resection were independently associated with survival (HR 7.23 and 0.12, respectively). Conclusion Surgical resection shows favorable outcome for all pNET tumors, including indolent tumors and tumors with distant metastases. Prospective trials should be initiated to confirm these results.
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Affiliation(s)
- C G Genc
- Department of Surgery, Academic Medical Center, Meibergdreef 9, PO Box 22660, 1105 AZ, Amsterdam, The Netherlands
| | - H J Klümpen
- Department of Medical Oncology, Academic Medical Center, Amsterdam, The Netherlands
- Cancer Center Amsterdam, Amsterdam, The Netherlands
| | - M G H van Oijen
- Department of Medical Oncology, Academic Medical Center, Amsterdam, The Netherlands
- Cancer Center Amsterdam, Amsterdam, The Netherlands
- Department of Research, Comprehensive Cancer Centers Netherlands (IKNL), Utrecht, The Netherlands
| | - C H J van Eijck
- Department of Surgery, Erasmus Medical Center, Rotterdam, The Netherlands
| | - E J M Nieveen van Dijkum
- Department of Surgery, Academic Medical Center, Meibergdreef 9, PO Box 22660, 1105 AZ, Amsterdam, The Netherlands.
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15
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Is radical surgery always curative in pancreatic neuroendocrine tumors? A cure model survival analysis. Pancreatology 2018; 18:313-317. [PMID: 29487026 DOI: 10.1016/j.pan.2018.02.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/24/2017] [Revised: 01/17/2018] [Accepted: 02/18/2018] [Indexed: 12/11/2022]
Abstract
BACKGROUND Adjuvant therapy after curative surgery for sporadic pancreatic neuroendocrine tumor (pNETs) is not currently recommended, assuming that all patients could be cured by a radical resection. The aim of our study is to establish how many and which kind of patients remained uncured after radical resection of pNET. METHODS Retrospective study involving 143 resected sporadic pNETs. The survival analysis was carried out using the cure model, describing the cure fraction and the excess of risk recurrence. Multivariate analyses were made in order to evaluate the non negligible effect of demographics, clinical and pathological factors on survival parameters. The results were reported as percentages, fractions, ORs and HRs with 95% confidence interval (95 CI %). RESULTS The cure fraction and the excess of hazard rate of the whole population were 57.1% (37.4-74.6, 95% CI) and 0.06 (0.03-0.07, 95% CI), respectively. Two independent factors were related to the cure fraction: TNM stage (OR 0.27 ± 0.17; P = 0.002) and grading (OR 0.11 ± 0.18; P = 0.004). Considering the excess of hazard rate, only two independent factors were related to an increased risk of recurrence: TNM stage (HR 3.49 ± 1.12; P = 0.004) and grading (HR 4.93 ± 1.82; P < 0.001). CONCLUSION The radical surgery has a high probability of cure in stages I-II or in grading 1 while, in stages III-IV or in grading 3 tumors, surgery alone failed to achieve a "cure". A multimodal treatment should be employed in order to avoid a recurrence of the disease.
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16
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Ricci C, Casadei R, Taffurelli G, Pacilio CA, Campana D, Ambrosini V, Donatella S, Minni F. Sporadic Small (≤20 mm) Nonfunctioning Pancreatic Neuroendocrine Neoplasm: is the Risk of Malignancy Negligible When Adopting a More Conservative Strategy? A Systematic Review and Meta-analysis. Ann Surg Oncol 2017; 24:2603-2610. [DOI: 10.1245/s10434-017-5946-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Indexed: 12/18/2022]
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