Hereditary diffuse gastric cancer in progress: Comparative lessons from Lynch syndrome

Area of Science:

• Genetics and Oncology
• Hereditary Cancer Syndromes

Background:

• Hereditary diffuse gastric cancer (HDGC) and Lynch syndrome are dominant inherited cancer predisposition syndromes.
• HDGC involves CDH1/CTNNA1 variants, increasing risks for gastric and breast cancers.
• Lynch syndrome, linked to mismatch repair genes, predisposes to various cancers including colorectal and endometrial.

Purpose of the Study:

• To draw an analogy between HDGC and Lynch syndrome to advance HDGC understanding.
• To leverage the century of Lynch syndrome research to address HDGC's knowledge gaps.
• To improve identification of HDGC genes, variant interpretation, and surveillance strategies.

Main Methods:

• Comparative analysis of genetic origin, variant effects, and clinical outcomes.
• Literature review and synthesis of existing research on both syndromes.
• Postulation of applying Lynch syndrome research frameworks to HDGC.

Main Results:

• Significant disparities exist in the molecular understanding and patient management of HDGC compared to Lynch syndrome.
• HDGC research is less mature than Lynch syndrome research, which has over a century of study.
• An analogy highlights shared intricacies and potential for cross-syndrome learning.

Conclusions:

• Lessons from Lynch syndrome research can accelerate HDGC aetiology discovery.
• This approach may identify new candidate genes, refine variant interpretation, explain heterogeneity, and enhance surveillance for HDGC.
• The findings aim to impact clinical management and future research for HDGC.