Genetic testing by cancer site: stomach

Area of Science:

• Oncology
• Genetics
• Public Health

Background:

• Gastric cancer is a leading cause of cancer mortality globally, with limited survival rates.
• Hereditary factors contribute to approximately 10% of gastric cancers, often due to germline mutations.
• Specific genetic syndromes significantly elevate the risk of developing gastric cancer.

Purpose of the Study:

• To review genetic syndromes associated with gastric cancer.
• To outline current standards for genetic counseling, testing, and management.
• To provide guidelines for hereditary diffuse gastric cancer.

Main Methods:

• Literature review of genetic syndromes and their associated mutations.
• Analysis of current guidelines for genetic counseling and medical management.
• Discussion of screening and prophylactic strategies for high-risk individuals.

Main Results:

• Germline CDH1 mutations predispose to diffuse gastric cancer and lobular breast cancer.
• Individuals with CDH1 mutations have up to an 80% lifetime risk of gastric cancer.
• Other syndromes like Lynch, BRCA, FAP, Li-Fraumeni, Peutz-Jeghers, and juvenile polyposis also increase gastric cancer risk.

Conclusions:

• Prophylactic gastrectomy is recommended for CDH1 mutation carriers due to inadequate screening.
• Increased physician and genetic counselor awareness can improve detection and prevention.
• Genetic testing and counseling are crucial for managing hereditary gastric cancer syndromes.