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Why a CDH1 carrier's endoscopy often looks normal | CION Cancer Clinics
In hereditary diffuse gastric cancer, the earliest cancer cells hide under a stomach lining that looks completely normal. That is why a CDH1 carrier can have a clear endoscopy and still have tiny spots inside. This page explains why these spots are so hard to see, what a proper surveillance endoscopy does differently, and what a normal report can and cannot tell you. At CION Cancer Clinics, our oncologists plan screening and care for families with an inherited cancer syndrome, explained in plain words.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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On this page
- Why can a CDH1 carrier have a normal endoscopy and still have cancer cells?
- What makes these early spots so hard to find?
- What makes a surveillance endoscopy different from a routine one?
- The words you will meet, in plain language
- A routine endoscopy or a surveillance endoscopy?
- What this page cannot tell you
- Four things carriers tell us, and what is actually true
- Common questions about endoscopy in CDH1 carriers
The short answer
Why can a CDH1 carrier have a normal endoscopy and still have cancer cells?
Because the earliest cancer in hereditary diffuse gastric cancer does not look like anything. It starts as tiny clusters of single cells sitting under a stomach lining that stays smooth and pink. The camera sees the surface, and the surface is usually normal.
Not a lump, not an ulcer
Most stomach cancers begin as a growth, a raised patch or an ulcer that an endoscopist can spot and sample. The diffuse type linked to CDH1 behaves differently. Its cells lose their grip on their neighbours and slip in between healthy cells one by one, so there is no lump to see until much later.
What this means for your report
A report that says "normal study" is accurate about what the camera saw. It is not proof that no early spots exist. For a CDH1 carrier, it is one piece of information among several, and it is read alongside the biopsy results and your family history.
For people without a CDH1 fault, a normal endoscopy is genuinely reassuring. This page is about carriers.Four reasons
What makes these early spots so hard to find?
None of these is a failure by the doctor. They are features of the disease itself.
They sit under the surface
The early cells gather in the layer just beneath the lining. The top layer that the camera looks at is usually intact, so nothing breaks the surface.
They are extremely small
Many spots are smaller than a grain of rice, and some are visible only under a microscope. At that size, even a skilled eye on a high-quality screen can pass over them.
They are scattered
Spots can appear anywhere in the stomach and in several places at once. A biopsy takes a sample about the size of a pinhead, so even many biopsies test only a small part of the lining.
Sometimes seen as
- A faint pale patch in the lining
- A slightly different texture under close view
Later cancer can still look quiet
Even when diffuse cancer has grown, it tends to thicken the stomach wall from inside rather than form a mass. The lining can look only mildly changed, which is why symptoms often come before an obvious finding.
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Ask an oncologistHow the odds are improved
What makes a surveillance endoscopy different from a routine one?
More time on the table
A surveillance endoscopy for a CDH1 carrier is slow on purpose. The endoscopist inspects every area of the stomach carefully instead of doing a quick check for ulcers.
A clean, stretched lining
The stomach is washed and gently inflated with air, so folds open out and faint pale patches are easier to see.
Targeted and random biopsies
Anything unusual is sampled first. Then many small biopsies are taken from set areas across the stomach, following a written protocol, even where the lining looks perfect.
A pathologist who knows what to look for
The samples are read by a pathologist familiar with these cells, because single cancer cells among normal ones are easy to overlook on a slide.
Repeated every year
One clear endoscopy says little on its own. Repeating it yearly adds chances to catch something, which is why carriers who delay surgery are advised not to skip it.
On your endoscopy report
The words you will meet, in plain language
- Diffuse type
- A stomach cancer that spreads as loose single cells rather than forming a lump. This is the type linked to CDH1.
- Signet ring cells
- The cancer cells pathologists look for, named after their shape under the microscope. A report may call them SRCC.
- Random biopsies
- Small samples taken from set places across the stomach whether or not anything looks abnormal.
- Targeted biopsies
- Samples taken from a specific area that looked different, such as a pale patch.
- No evidence of malignancy
- No cancer cells were seen in the samples taken. It describes those samples only, not the whole stomach.
- Cambridge protocol
- A widely used written method for surveillance endoscopy in CDH1 carriers, setting out how to inspect and where to take biopsies.
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Side by side
A routine endoscopy or a surveillance endoscopy?
Routine endoscopy
Surveillance for a CDH1 carrier
Looks for ulcers, bleeding and growths
Looks for faint pale patches as well
Often quick, sometimes without sedation
Slow and thorough, usually with sedation
A few biopsies, only if something looks wrong
Many biopsies from set areas, even if all looks normal
A normal result is strongly reassuring
A normal result lowers worry but cannot rule spots out
Done when symptoms appear
Done every year, with or without symptoms
Being straight with you
What this page cannot tell you
It cannot tell you whether your own stomach is clear. No page can, and honestly no single endoscopy can either. What it can do is explain why your doctors may still talk about removing the stomach after a normal report, and why that is not a contradiction.
It cannot read your biopsy report
What your specific variant means is a question for the counsellor who ordered the test, and what your biopsies show is a question for the team who took them. If signet ring cells were found in even one small sample, that changes the plan, and it needs a same-week conversation with your surgeon, not a search online.
Who this does not apply to
Most people who have an endoscopy for acidity, pain or indigestion do not carry a CDH1 fault. For them a normal endoscopy means what it says. This page also does not apply to relatives who have tested negative for the family's fault. Research on how often surveillance misses early spots is still based on fairly small groups, mostly outside India.
If you are a carrier and your endoscopy was done without biopsies, ask whether it followed a surveillance protocol.Commonly believed
Four things carriers tell us, and what is actually true
"My scope was normal, so I am clear."
You are clear of anything the camera and the samples could find that day. For a CDH1 carrier, early spots can sit in places the camera cannot see and the biopsies did not reach.
"If I had cancer, I would feel something."
Early diffuse cancer rarely causes symptoms. By the time there is pain, weight loss or early fullness, the disease has usually grown. Feeling well is not a guide.
"A better machine would find everything."
High-definition scopes help, and so do careful protocols. But many early spots are only visible under the microscope, so no camera will see all of them.
"Doctors want surgery because they do not trust their own scope."
They recommend it because they understand the limits of their tools. In most stomachs removed from carriers, pathologists find tiny spots that surveillance had not shown. Being open about that is part of good care.
Questions we are asked
Common questions about endoscopy in CDH1 carriers
Is surveillance endoscopy pointless, then?
No. It can find spots, and finding one early changes the plan. It is the right choice for carriers who are not yet ready for surgery. It is simply less reliable than people expect, which is why guidelines still favour removing the stomach for most confirmed carriers.
How many biopsies are taken?
Many more than in a routine endoscopy. The protocol sets out areas across the stomach and takes several samples from each, plus any from areas that look different. Your endoscopist can tell you exactly how many were taken and from where.
Does the procedure hurt?
It is longer than a routine endoscopy, so sedation is usually offered to keep you comfortable. Biopsies are not felt, because the stomach lining has no pain nerves of that kind. Mild throat soreness or bloating afterwards is common and settles within a day.
What if they find signet ring cells?
Then the discussion moves from prevention to treatment, and usually towards surgery soon. Very early spots found this way are often confined to the lining. Your surgeon and oncologist will explain what the finding means for you specifically.
Can a CT scan or blood test find these spots instead?
No. CT scans, ultrasound and tumour marker blood tests do not pick up spots this small. Endoscopy with biopsies is the only surveillance method currently recommended for the stomach in CDH1 carriers.
Can this endoscopy be done in my district?
A routine endoscopy is widely available, but a surveillance endoscopy needs an endoscopist and pathologist familiar with the protocol. Travelling to a specialist centre for it once a year is worth the effort. Take your earlier reports and slides with you.
Should my children have endoscopy?
Children are not usually scoped unless the family pattern is unusually early. Testing for the family's fault is normally offered around adulthood, and surveillance or surgery is discussed after that. Your counsellor will advise on timing for your family.
My endoscopy was normal but I still have symptoms. What now?
Tell your doctor promptly, and mention that you carry a CDH1 fault. Ongoing pain, early fullness, vomiting or weight loss in a carrier should not be put down to acidity without a proper review, even after a recent normal report.
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MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
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MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
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Sources
- GeneReviews (NCBI) — Hereditary Diffuse Gastric Cancer
- MedlinePlus Genetics — Hereditary diffuse gastric cancer
- NHS — Gastroscopy
- MedlinePlus Genetics — CDH1 gene
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
Related pages
Cambridge protocol surveillance endoscopyExactly what happens at a surveillance endoscopyThe gastrectomy decision in HDGCWeighing surgery against yearly endoscopyHereditary diffuse gastric cancer explainedThe syndrome, from the beginningBreast surveillance in CDH1 familiesThe other check women carriers need
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