Skip to content
knowrare
HealthSignal
Your condition community

Living with Hereditary diffuse gastric adenocarcinoma

An inherited condition that raises the chance of a certain kind of stomach cancer, and of lobular breast cancer in women.

Understanding Hereditary diffuse gastric adenocarcinoma

Hereditary diffuse gastric cancer (HDGC) is an inherited condition that raises the risk of a type of stomach cancer called diffuse gastric cancer.

Women with HDGC also have a higher risk of lobular breast cancer. Cancers tied to HDGC generally occur at younger ages than in people without an inherited risk. Diagnosis is based on symptoms and family history and can be confirmed by genetic testing. It affects adults.

Signs & symptoms

GARD doesn't list specific symptoms for this condition yet.

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include cancer specialists, digestive system specialists and genetic specialists.

  3. Consider genetic testing

    Changes in CDH1 are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

  4. Connect with expert centers

    FORCE: Facing Our Risk of Cancer Empowered may keep lists of experts for this condition.

Care & treatment

Care team
Cancer specialists (oncologists); Digestive system specialists (gastroenterologists); Genetic specialists (geneticists)
Expert care
Expert lists: FORCE: Facing Our Risk of Cancer Empowered
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with FORCE: Facing Our Risk of Cancer Empowered and other patient organizations
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Should I have genetic testing for CDH1 and CTNNA1?
What screening for stomach and breast cancer is right for me?
Which relatives should be told about a gene change?

Quick facts

Symptoms usually startAdult
InheritanceAutosomal Dominant
GenesCDH1

It is caused by changes in the CDH1 gene and the CTNNA1 gene. It is autosomal dominant, so one changed copy of the gene is enough to raise risk.

GeneticGastrointestinal

Also known as: diffuse gastric and lobular breast cancer syndrome; familial diffuse cancer of stomach; familial diffuse gastric cancer; fdgc; hdgc; hereditary diffuse cancer of stomach

Patient organizations

Source: NIH GARD · Hereditary diffuse gastric adenocarcinomaGARD ID 10900 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Hereditary diffuse gastric adenocarcinoma.

Explore the Hereditary diffuse gastric adenocarcinoma blog

Explore research for Hereditary diffuse gastric adenocarcinoma

Explore actively recruiting Hereditary diffuse gastric adenocarcinoma studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Hereditary diffuse gastric adenocarcinoma with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

Powered by HealthSpark, our AI chat helper

I can help you find recruiting Hereditary diffuse gastric adenocarcinoma studies. Enter a ZIP code, address or city below and I'll look within 50 miles.

Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

Get Signals for Hereditary diffuse gastric adenocarcinoma

Stay in the loop with community stories and updates from medical researchers.

HealthStoryfor Hereditary diffuse gastric adenocarcinoma

Create a living journal that talks back

HealthStory evolves private journaling with a living AI journal that talks back and asks thoughtful questions, helping you capture your Hereditary diffuse gastric adenocarcinoma experiences more deeply and prepare for better conversations with your doctors and care team.

Start your journal

Your journal is private. Sharing your story publicly is a separate choice, made with Share your story above.