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RNF43 Mutations in IPMN Cases: A Potential Prognostic Factor.

Xiao Yan Chang1, Yan Wu1, Ying Jiang1

  • 1Department of Pathology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tsinghua University, Beijing 100730, China.

Gastroenterology Research and Practice
|September 16, 2020
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Summary

Intraductal papillary mucinous neoplasms (IPMNs) frequently carry KRAS and GNAS mutations. RNF43 mutations, found in advanced IPMNs, correlate with a worse prognosis in invasive cases.

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Area of Science:

  • Pancreatology
  • Molecular Oncology
  • Gastroenterology

Background:

  • Intraductal papillary mucinous neoplasms (IPMNs) are common precursor lesions of pancreatic cancer.
  • IPMNs frequently exhibit mutations in KRAS, GNAS, and RNF43 genes.

Purpose of the Study:

  • To elucidate the molecular landscape of IPMNs.
  • To investigate the mutation profiles of KRAS, GNAS, and RNF43 in IPMN specimens.
  • To correlate molecular findings with clinicopathological features and patient prognosis.

Main Methods:

  • Mutation analysis of KRAS, GNAS, and RNF43 in 61 IPMN formalin-fixed, paraffin-embedded specimens.
  • Sanger sequencing for KRAS and GNAS mutations.
  • Next-generation sequencing and Sanger sequencing for RNF43 mutations.

Main Results:

  • KRAS and GNAS mutations were identified in 57% and 66% of IPMN cases, respectively.
  • GNAS mutations showed significant correlation with IPMN morphologic subtypes, being most prevalent in the intestinal subtype.
  • RNF43 mutations (8%) were exclusively found in high-grade dysplasia and invasive IPMNs, often co-occurring with GNAS mutations and associated with a worse prognosis.

Conclusions:

  • KRAS and GNAS mutations are common in IPMNs and linked to specific subtypes.
  • RNF43 mutations are rare but indicate advanced disease and predict a poorer prognosis in invasive IPMN.
  • Molecular profiling of IPMNs can inform risk stratification and patient management.