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Hereditary diffuse gastric cancer: updated clinical practice guidelines.

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Updated guidelines for hereditary diffuse gastric cancer (HDGC) now relax genetic testing criteria and offer endoscopic surveillance as an alternative to prophylactic gastrectomy for CDH1 variant carriers.

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Area of Science:

  • Oncology
  • Genetics
  • Gastroenterology

Background:

  • Hereditary diffuse gastric cancer (HDGC) is an autosomal dominant syndrome linked to CDH1 and CTNNA1 gene mutations.
  • It presents with high risks of diffuse gastric and lobular breast cancers.
  • Clinical management requires balancing genetic testing accessibility with cancer risk.

Purpose of the Study:

  • To present updated clinical practice guidelines for HDGC from the International Gastric Cancer Linkage Consortium (IGCLC).
  • To incorporate new evidence on gastric cancer risk variability, surveillance capabilities, and post-gastrectomy management.
  • To revise genetic testing criteria and risk management strategies for HDGC.

Main Methods:

  • Review of emerging evidence on HDGC risk, surveillance, and surgical outcomes.
  • Analysis of international clinical experience and expert consensus.
  • Revision of genetic testing criteria and management recommendations.

Main Results:

  • Relaxed genetic testing criteria for HDGC, particularly age limits.
  • Recognition of variability in gastric cancer risk among HDGC families.
  • Increased confidence in endoscopic surveillance as a safe alternative to prophylactic gastrectomy in expert centers.

Conclusions:

  • Updated IGCLC guidelines provide a more accessible approach to genetic testing for HDGC.
  • Endoscopic surveillance is a viable option for managing gastric cancer risk in selected CDH1 variant carriers.
  • Prophylactic total gastrectomy remains the primary recommendation for high-risk individuals, but surveillance offers an alternative for others.