Cited by 207Pancreatic and Hepatic Oncology ResearchNeuroendocrine Tumor Research AdvancesPancreatitis Pathology and Treatment

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Preoperative GNAS and KRAS Testing in the Diagnosis of Pancreatic Mucinous Cysts

Abstract

PURPOSE: Management guidelines for pancreatic intraductal papillary mucinous neoplasms (IPMN) and mucinous cystic neoplasms (MCN) are based on the assumption that mucinous cysts can be accurately distinguished from other pancreatic cystic lesions. Previous studies using surgical material have identified recurrent mutations in GNAS and KRAS in pancreatic mucinous neoplasms. Yet, the diagnostic utility of testing for both genes in pancreatic cyst fluid obtained by endoscopic ultrasound-fine-needle aspiration (EUS-FNA) remains unclear. EXPERIMENTAL DESIGN: GNAS and KRAS testing was performed on EUS-FNA pancreatic cyst fluid from 91 pancreatic cysts: 41 IPMNs, 9 IPMNs with adenocarcinoma, 16 MCNs, 10 cystic pancreatic neuroendocrine tumors (PanNET), 9 serous cystadenomas (SCA), 3 retention cysts, 2 pseudocysts, and 1 lymphoepithelial cyst. RESULTS: Mutations in GNAS were detected in 16 (39%) IPMNs and 2 (22%) IPMNs with adenocarcinoma. KRAS mutations were identified in 28 (68%) IPMNs, 7 (78%) IPMNs with adenocarcinoma, and 1 (6%) MCN. Mutations in either gene were present in 34 (83%) IPMNs, 8 (89%) IPMNs with adenocarcinoma, and 1 (6%) MCN. No mutations were found in cystic PanNETs, SCAs, retention cysts, pseudocysts, and a lymphoepithelial cyst. GNAS and KRAS mutations had 100% specificity [95% confidence interval (CI), 0.83-1.00] but 65% sensitivity (95% CI, 0.52-0.76) for mucinous differentiation. Among IPMNs, mutations in either gene had 98% specificity (95% CI, 0.86-1.00) and 84% sensitivity (95% CI, 0.70-0.92). CONCLUSIONS: The combination of GNAS and KRAS testing was highly specific and sensitive for IPMNs; however, the lack of sensitivity for MCNs highlights the need for additional markers to improve the detection of pancreatic mucinous neoplasms.

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Crossref · 10.1158/1078-0432.ccr-14-0513

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Metadata

Authors
Singhi, A. D., Nikiforova, M. N., Fasanella, K. E., McGrath, K. M., Pai, R. K., Ohori, N. P., Bartholow, T. L., Brand, R. E., Chennat, J. S., Lu, X., Papachristou, G. I., Slivka, A., Zeh, H. J., Zureikat, A. H., Lee, K. K., Tsung, A., Mantha, G. S., & Khalid, A.
Affiliations
  • Departments of 1Pathology,
  • 2Medicine, and
  • VA Pittsburgh Healthcare System (US)
  • University of Pittsburgh Medical Center (US)
Corresponding author
Singhi, Aatur D.
Venue
Clinical Cancer Research
Published
2014-08-13
Volume
20
Issue
16
Pages
4381-4389
ISSN
  • 1078-0432 (ISSN-L)
  • 1557-3265
OpenAlex
W2139069376
Cited by
207
References
3
Citations by year
2026: 9 · 2025: 17 · 2024: 18 · 2023: 14 · 2022: 11 · 2021: 19 · 2020: 16 · 2019: 27 · 2018: 20 · 2017: 27 · 2016: 16 · 2015: 13
FWCI
8.98
Type
journal article
Language
en
Open access
closed
Locations
  • Clinical Cancer Research (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Pancreas Foundation
Topics
  • Health Sciences › Medicine › Oncology › Pancreatic and Hepatic Oncology Research
  • Health Sciences › Medicine › Oncology › Neuroendocrine Tumor Research Advances
  • Health Sciences › Medicine › Surgery › Pancreatitis Pathology and Treatment
Keywords
intraductal papillary mucinous neoplasm, mucinous cystic neoplasm, GNAS mutation, KRAS mutation, pancreatic cyst fluid, endoscopic ultrasound-guided fine-needle aspiration, preoperative genetic testing, sensitivity and specificity, pancreatic neuroendocrine tumors, serous cystadenoma, pancreatic ductal adenocarcinoma, pancreatic cysts
MeSH terms
Adenocarcinoma, Adult, Aged, Aged, 80 and over, Adenocarcinoma, Mucinous, Carcinoma, Papillary, Chromogranins, Female, Follow-Up Studies, Humans, Male, Middle Aged, Mutation, Neoplasm Staging, Pancreatic Cyst, Pancreatic Neoplasms, Preoperative Care, Prognosis, Proto-Oncogene Proteins, Biomarkers, Tumor, Proto-Oncogene Proteins p21(ras), Cystadenoma, Serous, ras Proteins, GTP-Binding Protein alpha Subunits, Gs, Cyst Fluid, Carcinoma, Pancreatic Ductal, Biopsy, Fine-Needle, Young Adult

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