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Gut 62:1024-1033 doi:10.1136/gutjnl-2012-302823
  • Pancreas
  • Original article

Mutant GNAS detected in duodenal collections of secretin-stimulated pancreatic juice indicates the presence or emergence of pancreatic cysts

  1. Michael Goggins1,7,8
  1. 1Departments of Pathology, The Sol Goldman Pancreatic Cancer Research Center, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
  2. 2Mayo Clinic, Baltimore, Maryland, USA
  3. 3Dana Farber Cancer Institute, Boston, Massachusetts, USA
  4. 4University of California at Los Angeles, Los Angeles, California, USA
  5. 5MD Anderson Cancer Center, Houston, Texas, USA
  6. 6Departments of Radiology, The Sol Goldman Pancreatic Cancer Research Center, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
  7. 7Departments of Medicine, The Sol Goldman Pancreatic Cancer Research Center, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
  8. 8Departments of Oncology, The Sol Goldman Pancreatic Cancer Research Center, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
  1. Correspondence to Dr Michael Goggins, Johns Hopkins Medical Institutions, Department of Pathology, 1550 Orleans Street, Baltimore, MD 21231, USA; mgoggins{at}jhmi.edu
  1. Contributors MK: acquisition of data, analysis and interpretation of data, drafting of the manuscript. SK, MB, AY, SF, JS: acquisition of data. JE, MDT, SS, JF, JHL, IK, AML: generation of data, revision of the manuscript. RHH: material support, acquisition and interpretation of data, manuscript revision. MIC: material support, acquisition and interpretation of data, study supervision, revision of the manuscript, obtained funding. MG: study concept and design, study supervision, interpretation of data, drafting of the manuscript, obtained funding. MG had full access to all of the data and takes full responsibility for the veracity of the data and statistical analysis.

  • Revised 20 June 2012
  • Accepted 22 June 2012
  • Published Online First 2 August 2012

Abstract

Objective Pancreatic cysts are commonly detected in patients undergoing pancreatic imaging. Better approaches are needed to characterise these lesions. In this study we evaluated the utility of detecting mutant DNA in secretin-stimulated pancreatic juice.

Design Secretin-stimulated pancreatic juice was collected from the duodenum of 291 subjects enrolled in Cancer of the Pancreas Screening trials at five US academic medical centres. The study population included subjects with a familial predisposition to pancreatic cancer who underwent pancreatic screening, and disease controls with normal pancreata, chronic pancreatitis, sporadic intraductal papillary mucinous neoplasm (IPMN) or other neoplasms. Somatic GNAS mutations (reported prevalence ∼66% of IPMNs) were measured using digital high-resolution melt-curve analysis and pyrosequencing.

Results GNAS mutations were detected in secretin-stimulated pancreatic juice samples of 50 of 78 familial and sporadic cases of IPMN(s) (64.1%), 15 of 33 (45.5%) with only diminutive cysts (<5 mm), but none of 57 disease controls. GNAS mutations were also detected in five of 123 screened subjects without a pancreatic cyst. Among 97 subjects who had serial pancreatic evaluations, GNAS mutations detected in baseline juice samples predicted subsequent emergence or increasing size of pancreatic cysts.

Conclusion Duodenal collections of secretin-stimulated pancreatic juice from patients with IPMNs have a similar prevalence of mutant GNAS to primary IPMNs, indicating that these samples are an excellent source of mutant DNA from the pancreas. The detection of GNAS mutations before an IPMN is visible suggests that analysis of pancreatic juice has the potential to help in the risk stratification and surveillance of patients undergoing pancreatic screening.

Footnotes

  • Funding This work was supported by NIH grants (CA62924, R01CA120432, and RC2CA148376), the Lustgarten Foundation for Pancreatic Cancer Research, the Jimmy V Foundation, the Michael Rolfe Foundation, and Karp Family H H Metals, Inc Fund for Cancer Research Michael Hooven and Susan Spies. Material support: ChiRhoClin (secretin).

  • Correction notice This article has been corrected since it was published Online First. The author affiliations have been amended.

  • Competing interests MG and RHH have a licensing agreement with Myriad Genetics for the discovery of PALB2 as a pancreatic cancer susceptibility gene. There are no other conflicts of interest for any of the authors. Recombinant secretin was provided for this study but the companies involved had no part in the design of this study, analysis or interpretation of data or in the writing of this manuscript.

  • Patient consent Obtained.

  • Ethics approval Ethics approval was provided by Johns Hopkins Joint Committee for Clinical Investigation.

  • Provenance and peer review Not commissioned; externally peer reviewed.