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CION Cancer Clinics
Preventive gastrectomy for CDH1 carriers: what the team weighs | CION Cancer Clinics
A preventive gastrectomy removes a healthy stomach from a person who carries a harmful CDH1 gene change, before any cancer is found. It is offered because the stomach cancer linked to CDH1 grows as scattered cells under the lining, where endoscopy often misses it until late. This page explains what the team weighs, the surveillance alternative, and what to ask. It does not tell you what to decide. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
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Medically reviewed by Dr. Muralidhar MuddusettyConsultant Surgical Oncologist · MBBS (AIIMS), MS (Surgery, AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh) · last reviewed September 2026, next review due September 2027
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On this page
- Why would anyone remove a healthy stomach?
- What the team weighs before the operation is offered
- What happens between the gene result and the operation
- Words on the genetics report, in plain language
- Four things families tell us, and what is actually true
- What this page cannot tell you
- Common questions about preventive gastrectomy
The short answer
Why would anyone remove a healthy stomach?
A preventive gastrectomy removes the whole stomach before any cancer has been found, in a person who carries a faulty CDH1 gene. It is offered because the stomach cancer linked to CDH1 grows as scattered cells under the lining, where an endoscopy camera and even biopsies often miss it until it is advanced.
What CDH1 does
CDH1 is a gene that helps cells stick together. When it is faulty, a person has a much higher lifetime chance of a type of stomach cancer called hereditary diffuse gastric cancer, and women carry a higher chance of a type of breast cancer called lobular breast cancer. The fault runs in families, and each child of a carrier has an even chance of inheriting it.
Why the camera is not enough
Diffuse means spread out. Instead of forming a lump that a camera can see, these cancer cells sit in small clusters beneath the stomach lining. Regular endoscopy with many random biopsies is the alternative to surgery, and it does find some early cancers. It also misses some. That gap is the whole reason the operation exists.
Nobody is told they must have this operation. The decision sits with you, your family and your team. This page says what the team weighs, not what to decide.The decision
What the team weighs before the operation is offered
The operation is discussed only when several things line up. Each is a question you can ask about your own case.
A confirmed harmful CDH1 change
The blood test must show a change that is known to cause disease, not a change of uncertain meaning. Many CDH1 results fall in the uncertain group, and those do not lead to surgery.
The family history
How many relatives had diffuse stomach cancer, and at what ages. A family where the cancer struck young pushes the discussion earlier. A family with the gene change but no cancers is weighed differently.
Your age and general health
The operation is usually discussed in early adulthood, after the carrier has finished growing and can weigh the decision as an adult. Fitness for a major operation matters as much as the gene.
What the endoscopy found
Most carriers have an endoscopy with many biopsies first. If cancer cells are already found, the conversation changes from prevention to treatment, and the timing becomes less open.
What you want
Some carriers want the risk gone and accept life without a stomach. Others prefer regular endoscopy and accept the chance of a missed cancer. Both are reasonable, and the team will say so.
Not sure whether this applies to you?
Ask an oncologistThe pathway
What happens between the gene result and the operation
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Genetic counselling
Before or just after the blood test, a counsellor explains what a positive result means for you and for your brothers, sisters and children. Bring the family member who will share the decision.
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Confirming the result
The report is checked to confirm the change is harmful, not of uncertain meaning. If your relative was tested first, your result is read alongside theirs.
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Endoscopy with many biopsies
A camera examination of the stomach with samples taken from every region, not just where something looks odd. This sets a baseline and sometimes finds early cancer cells.
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Tumour board and a family meeting
Your case is discussed by surgical, medical and genetics specialists together. Then the options are laid out for you with time to think. Nobody should be rushed into this operation.
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Preparing for surgery
Fitness tests, a dietitian visit to explain eating afterwards, and a plan for vitamin B12 injections for life, because the stomach is where B12 is absorbed.
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The operation and the report
A total gastrectomy with the bowel joined to the gullet. The removed stomach is examined in fine detail, and very often the report finds early cancer cells that no camera had seen.
On your report
Words on the genetics report, in plain language
- Pathogenic variant
- A gene change known to cause disease. This is the result that opens the discussion about surgery.
- Variant of uncertain significance
- A change whose meaning is not yet known. It does not lead to surgery and is usually reviewed again as knowledge improves.
- Hereditary diffuse gastric cancer
- The inherited stomach cancer linked to CDH1. Diffuse means the cells spread through the lining rather than forming one lump.
- Signet ring cells
- The shape of the cancer cells under the microscope. Finding them in a biopsy or in the removed stomach confirms the diagnosis.
- Penetrance
- How likely a person with the gene change is to develop the cancer. It is high for CDH1 but not certain, which is why the choice is real.
- Cascade testing
- Offering the blood test to close relatives once one person in the family has a confirmed result.
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Commonly believed
Four things families tell us, and what is actually true
"If the endoscopy was clear, there is no cancer."
A clear endoscopy lowers the worry but does not settle it. The cells this gene causes hide under the lining. When a stomach is removed for prevention, the pathology report frequently finds early cancer cells that the camera and biopsies had missed.
"He is young and healthy. Surgery can wait until there is a problem."
Waiting is a legitimate choice, and some carriers make it with regular endoscopy. But by the time this cancer causes symptoms it has often spread, so waiting for a problem is not the same as waiting under surveillance.
"Once the stomach is out, the gene is dealt with."
The stomach cancer risk goes with the stomach. The gene stays. Women still need breast screening, usually with MRI, and your children can still inherit the change. Genetic counselling for the wider family remains important.
"Nobody can live without a stomach."
Many people do. Eating changes: small frequent meals, chewing well, B12 injections for life, and watching weight and iron. The first months are hard and most people adjust over the first year.
Did you know
Every case at CION is discussed at a tumour board before a plan is confirmed. For an inherited cancer risk, that discussion brings the surgeon, the genetics counsellor and the dietitian into the same room, so the plan you hear covers the operation and the life that follows it.
Being straight with you
What this page cannot tell you
This page cannot tell you whether to have the operation, or when. That depends on your exact gene change, your family's history, your age, your health and what you can live with. Two carriers in the same family can reasonably choose differently.
Who this operation does not suit
It is not offered to people whose CDH1 result is of uncertain meaning, to those who are not fit enough for major surgery, or to those who are not ready to live with the eating changes that follow. It is also not a treatment for a cancer that has already spread beyond the stomach. In that situation the plan is different and your oncologist will explain it.
Questions worth asking your team
Ask what your specific gene change is and how certain its meaning is. Ask what surveillance would involve if you chose it, and how often. Ask how often your surgeon does this operation and who will look after your eating and vitamins afterwards. Ask what testing is available for your children and siblings.
If you have a CDH1 result and do not know where to start, call the helpline. We will help you reach a genetics counsellor and a surgical oncologist.Questions we are asked
Common questions about preventive gastrectomy
Do all CDH1 carriers get stomach cancer?
No. The lifetime chance is high but not certain, and it differs between families. That uncertainty is exactly why the decision is a real choice rather than an automatic one. Your genetics counsellor can explain what is known about your family's pattern.
At what age is the operation usually discussed?
Usually in early adulthood, once the carrier is old enough to weigh the decision and after any cancers in the family have been considered. If relatives were diagnosed young, the conversation tends to happen earlier. There is no fixed age, and the timing is part of what you decide with the team.
Can I choose regular endoscopy instead?
Yes. Surveillance endoscopy with many biopsies is a recognised alternative and some carriers choose it. The honest trade-off is that it can miss cancer cells hidden under the lining. Your team should explain how often it would be done and what it can and cannot find.
Is the whole stomach removed, or only part?
The whole stomach. The cells this gene causes can appear anywhere in the lining, so leaving part of the stomach would leave the risk. The bowel is then joined directly to the gullet, most often in a Roux-en-Y shape, and food passes straight into the small bowel.
What will eating be like afterwards?
Different, and it takes months to settle. Small meals many times a day, chewing well, and avoiding sweet drinks that cause dumping. Weight usually falls at first and then steadies. B12 injections are needed for life, and iron, calcium and vitamin D are checked regularly.
Does the operation remove the breast cancer risk too?
No. CDH1 also raises the chance of lobular breast cancer in women, and that risk stays after the stomach is removed. Breast screening, often with MRI, continues. Some women discuss risk-reducing breast surgery separately, and that is its own decision with its own team.
Should my brothers, sisters and children be tested?
They should be offered genetic counselling, and testing if they want it. Each child of a carrier has an even chance of carrying the change. Testing is usually offered from the age at which a result would change what is done, which the counsellor will explain for your family.
Is this operation done in Hyderabad?
Total gastrectomy is a standard cancer operation performed by surgical oncologists in Hyderabad. Ask any centre how often they perform it, whether a genetics service is part of the team, and who manages nutrition afterwards. Call the helpline and we will help you reach the right specialist.
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Sources
- National Cancer Institute — Genetics of Gastric Cancer (PDQ)
- Cancer Research UK — Risks and causes of stomach cancer
- American Cancer Society — Stomach cancer risk factors
- Macmillan Cancer Support — Stomach cancer
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
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Total vs Subtotal GastrectomyWhy the whole stomach is removed for CDH1How Food Travels After the Stomach Is RemovedWhat eating is like afterwardsVitamin B12 After Gastrectomy: Lifelong InjectionsThe one supplement that is never optionalLife One Year After GastrectomyWhat settles, and what stays differentDeciding on Cancer SurgeryHow to weigh a big decision with your team
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Have a CDH1 result and unsure where to start?
Tell us what the report says. We will help you reach a genetics counsellor and a surgical oncologist who can talk the options through with you and your family. One helpline serves every CION centre.