Medical Oncologist
CION Cancer Clinics
Surveillance for MSH2 carriers: what is checked and when | CION Cancer Clinics
If you carry an MSH2 fault, the heart of your plan is a colonoscopy from your early twenties, repeated every one to two years. Women add a plan for the womb and ovaries, and many carriers have stomach and urine checks from their thirties. This page sets out each check, when it starts, what it can and cannot do, and which symptoms should never wait for the next appointment. At CION Cancer Clinics, our oncologists explain what a gene result means for you and your family, and plan the checks that follow.
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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
- What checks does an MSH2 carrier need?
- What is checked, and how?
- When does each check start?
- What do the words in your surveillance plan mean?
- What surveillance does well, and where it is weaker
- What this page cannot tell you
- Four things carriers say about surveillance, and what is true
- Common questions about MSH2 surveillance
The short answer
What checks does an MSH2 carrier need?
The core of the plan is a colonoscopy, starting in your early twenties and repeated every one to two years. Women add a plan for the womb and ovaries. From your thirties, many carriers also have a camera test of the stomach and a urine check, because MSH2 raises the risk in those organs more than most Lynch genes do.
Why the checks start so early and come so often
In Lynch syndrome, a small growth in the bowel can turn into a cancer faster than usual. Frequent colonoscopy finds and removes those growths while they are still harmless. This is the single step with the strongest evidence behind it, and it is the one not to skip.
Symptoms that should not wait for the next check
A schedule does not replace your own attention. Tell your doctor within days, not at your next appointment, about any of these: bleeding from the back passage or black stools, a change in bowel habit that lasts, bleeding between periods or after the menopause, or blood in the urine. Most of the time the cause is something simple. It still needs checking promptly.
If a relative was diagnosed very young, your checks may start earlier than the usual age.Organ by organ
What is checked, and how?
Some checks are firmly recommended. Others are offered case by case, depending on your family history.
Bowel
Colonoscopy under sedation, done carefully and with a good bowel preparation. Growths are removed during the same test.
Stool tests and scans are not a substitute.Womb and ovaries
Regular review with a gynaecologist who knows Lynch syndrome. Some women are offered a sample of the womb lining during these visits. The ovaries cannot be screened reliably.
Also discussed
- Removing the womb and ovaries once the family is complete
- The effect on hormones and how it is managed
Stomach and small bowel
An upper endoscopy, a camera through the mouth, repeated every few years. A one-off test for the stomach infection H. pylori, treated if found.
Urinary tract
A yearly urine test may be offered, especially if a relative had cancer of the kidney drainage system or bladder. The evidence that this helps is limited.
Not sure whether this applies to you?
Ask an oncologistAcross a lifetime
When does each check start?
-
Late teens: counselling and the test
Young adults in the family are offered counselling and a test for the known family fault, in time for the first colonoscopy.
-
Early twenties: the first colonoscopy
Colonoscopy begins, then repeats every one to two years. It starts sooner if a relative had bowel cancer unusually young.
-
Thirties: the wider plan begins
Women start regular gynaecology review. Upper endoscopy and urine checks are usually added at some point in this decade.
-
Once the family is complete
Women talk through removing the womb and ovaries as one option among several. It is a choice, not a requirement, and it has its own page.
-
For life: keep going
Colonoscopy continues into older age for as long as you are fit for it. Men may also discuss prostate checks from middle age.
In the clinic
What do the words in your surveillance plan mean?
- Colonoscopy
- A thin camera passed into the large bowel, usually under sedation. It looks at the whole lining and removes growths.
- Polyp
- A small growth on the bowel lining. Most are harmless, but some can turn into cancer if left in place.
- Upper endoscopy
- A camera passed through the mouth to look at the food pipe, stomach and first part of the small bowel.
- H. pylori
- A common stomach infection that raises stomach cancer risk. It is found by a breath, stool or biopsy test and treated with tablets.
- Urinalysis
- A simple urine test that looks for hidden blood or abnormal cells.
- Surveillance interval
- The gap between one check and the next. Your team sets it, and it can shorten after a finding.
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Side by side
What surveillance does well, and where it is weaker
Works well
Weaker
Colonoscopy finds and removes bowel growths
The ovaries cannot be screened reliably
Womb symptoms tend to show early
Womb sampling has less evidence behind it
Endoscopy spots stomach changes
Much of the small bowel is out of reach
Urine tests are simple and cheap
Their benefit for survival is unproven
Being straight with you
What this page cannot tell you
It cannot set your own schedule. Start ages and gaps between checks shift with the age at which relatives were diagnosed, with what earlier colonoscopies found, and with your own health. Guidelines also differ slightly between countries. Your genetic counsellor and gastroenterologist will write a plan for you.
It cannot tell you what your result means
If your report shows an MSH2 variant of uncertain significance, this schedule may not apply to you. What your specific variant means is a question for the counsellor who ordered the test.
Who this does not apply to
Relatives who tested negative for the known family fault do not need this plan. They follow the same screening as anyone else their age, unless another side of the family raises its own concern. Most people with a single relative who had bowel cancer late in life also do not need Lynch-level checks.
Travelling from a district for each check is hard. Ask whether several tests can be booked on one visit.Commonly believed
Four things carriers say about surveillance, and what is true
"I feel perfectly well, so I can skip this year's colonoscopy."
Feeling well is the point. Colonoscopy is meant to find growths before they cause symptoms, when removing them is simple.
"My last colonoscopy was normal, so I can wait ten years like my friends."
That longer gap is for people without Lynch syndrome. In carriers, growths can develop quickly, so the short gap stays even after a clear result.
"A stool test or a blood marker can replace the camera."
Neither is a substitute in Lynch syndrome. They can miss small growths that colonoscopy would find and remove on the same day.
"Once the womb and ovaries are removed, I am done with checks."
That surgery removes two risks. The bowel, stomach and urinary tract risks remain, so colonoscopy and the other checks carry on.
Questions we are asked
Common questions about MSH2 surveillance
At what age should an MSH2 carrier start colonoscopy?
Usually in the early twenties. If a relative had bowel cancer at a young age, the first colonoscopy is often brought forward to a few years before that relative's age at diagnosis. Your gastroenterologist will set the exact starting point with you.
Why so often, when others go years between checks?
In Lynch syndrome, a small growth can become a cancer faster than usual. A gap of one to two years gives the best chance of catching growths while they can still be removed during the test. Longer gaps are designed for people without an inherited fault.
Is the ovary checked with an ultrasound or a blood test?
Neither is reliable enough to count as screening for ovarian cancer. That is why the ovaries are handled through a discussion about removing them once the family is complete. It is a personal decision, made with a gynaecologist who knows Lynch syndrome.
Do men with MSH2 need checks too?
Yes. Men follow the same colonoscopy plan and may be offered upper endoscopy and urine checks. Some guidelines also suggest talking about prostate checks from middle age for MSH2 carriers. The only checks men skip are those for the womb and ovaries.
Can several checks be done on one visit?
Often, yes. A colonoscopy and an upper endoscopy can usually be done under the same sedation. Urine tests can be added easily. For families travelling from districts, ask the team to combine checks so you make fewer trips.
What happens if a polyp is found?
It is usually removed during the same test and sent to the laboratory. Most are harmless. Depending on what the report shows, your next colonoscopy may be brought forward. A finding does not mean cancer. It usually means the plan is working.
Does aspirin help MSH2 carriers?
There is good evidence that daily aspirin lowers bowel cancer risk in Lynch syndrome. It is not right for everyone, because of bleeding and stomach side effects. Discuss it with your doctor before starting. It is an addition to colonoscopy, never a replacement.
Who writes and keeps track of my schedule?
Usually your genetic counsellor sets out the plan and a gastroenterologist runs the colonoscopy side. Ask for it in writing, with the next due date for each test. Call the CION helpline if you are not sure who is coordinating your checks.
Your Specialists
Meet CION's oncologists. Bring your family history or genetic report to them.
Our medical oncologists see people with a strong family history of cancer, arrange genetic counselling and testing where it fits, and plan the checks that follow.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
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Sources
- GeneReviews (NCBI) — Lynch Syndrome
- National Cancer Institute — Genetics of Colorectal Cancer (PDQ)
- Cancer Research UK — Lynch syndrome
- MedlinePlus Genetics — MSH2 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.
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Bring your MSH2 report and your family history, and we will help you set out a written schedule of checks. One helpline serves every CION centre.