Medical Oncologist
CION Cancer Clinics
Tested positive for MUTYH? What happens now | CION Cancer Clinics
The first thing to find out is whether your report shows one faulty MUTYH copy or two. Two faulty copies mean regular bowel checks, a camera test of the duodenum and testing for your brothers and sisters. One faulty copy usually changes very little. This page walks through the weeks after a positive result, who you will see, and what each result leads to. 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 should I do first after a positive MUTYH result?
- What does each type of result lead to?
- What happens in the weeks after the result?
- Which words on the report matter most?
- What changes after a positive result, and what stays the same?
- What this page cannot tell you
- What do people assume after a MUTYH result?
- Common questions after a positive MUTYH result
The short answer
What should I do first after a positive MUTYH result?
Find out whether the report shows one faulty copy or two, then book a genetic counselling appointment to go through it. Nothing needs to happen tonight. A MUTYH result is about risk over many years, and there is time to understand it before any decision is made.
The one question that sorts everything
Look for the words biallelic, homozygous or compound heterozygous. Any of these means two faulty copies. The words monoallelic, heterozygous on its own, or carrier mean one. If the report is unclear, do not guess. The counsellor who ordered the test can tell you in a minute.
Why it is worth reading slowly
Two faulty copies lead to a clear plan of checks that works well. One faulty copy usually leads to reassurance and little else. Families sometimes treat both results the same way, and either panic or shrug. Both mistakes are avoidable once you know which one you have.
If the result came from a large gene panel
Many people find out about MUTYH by accident, from a panel of many genes ordered for another reason, such as breast cancer. A single MUTYH copy found this way is common and usually unrelated to the cancer that prompted the test. Ask your doctor whether it changes anything. Often the answer is that it changes very little.
A positive result is information you can act on. It is not a cancer diagnosis.Two paths
What does each type of result lead to?
The plan splits in two, depending on the number of faulty copies. Two other situations need their own card.
Two faulty copies
You have MUTYH polyposis, or will be watched for it. The plan centres on colonoscopy and polyp removal, starting soon if you have not had one recently.
What usually follows
- A colonoscopy, if not recently done
- An upper endoscopy of the stomach and duodenum
- Testing offered to brothers and sisters
- A long-term schedule of checks
One faulty copy
You are a carrier. For most carriers, screening is based on the family history rather than the gene. Brothers and sisters may choose to be tested, mainly to inform their own family planning.
What usually follows
- A counselling appointment to confirm the result
- Screening based on who in the family had bowel cancer
- Partner testing if you are planning children
A variant of uncertain significance
The laboratory found a spelling difference and does not yet know whether it matters. It should not change your checks or your treatment. Ask how you will be told if it is ever reclassified.
If you already have bowel cancer
The result can shape the surgery and the checks on the rest of the bowel afterwards. Make sure your surgeon and oncologist see it before an operation is planned.
Not sure whether this applies to you?
Ask an oncologistThe next few weeks
What happens in the weeks after the result?
The counselling appointment
A genetic counsellor goes through the report with you, draws your family tree and explains what the result means. Bring the report and a list of relatives who have had cancer, with rough ages.
Your first checks
With two faulty copies, a colonoscopy is arranged if you have not had a recent one. An upper endoscopy follows, timed to your age. Polyps found are usually removed during the same test.
A long-term plan
The gastroenterologist sets the gap before your next checks from what was found. If there are too many polyps to manage by colonoscopy, surgery is discussed as one option.
Telling the family
The counsellor helps you decide who to tell and how. With two faulty copies, brothers and sisters matter most. Many families find a short written summary easier to share.
On your report
Which words on the report matter most?
- Homozygous
- Two copies of the same faulty variant. This counts as two faulty copies, and it is more common when parents are related by blood.
- Compound heterozygous
- Two different faulty variants, one on each copy. This also counts as two faulty copies.
- Heterozygous
- One faulty copy and one working copy. On its own, this word means you are a carrier.
- Pathogenic or likely pathogenic
- The laboratory is confident the variant breaks the gene. Both are acted on in the same way.
- VUS
- Variant of uncertain significance. It is not a positive result and not a reason to change anything yet.
- Cascade testing
- Offering a test for the exact family variant to relatives, starting with the closest.
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Side by side
What changes after a positive result, and what stays the same?
What changes
What stays the same
You start a planned schedule of bowel checks
You need no treatment if you are well
Relatives can be tested for your exact variants
Relatives who test negative keep routine screening
Your partner's result matters if you plan children
Young children are not usually tested
Bowel symptoms get checked sooner
Daily life, work and food carry on as before
Being straight with you
What this page cannot tell you
It cannot tell you what your particular result means. The same gene can carry many different variants, and a report has to be read alongside your family history and your own checks so far. What your specific variant means is a question for the counsellor who ordered the test.
It cannot set your schedule
Guidelines differ on when checks should start and how often they repeat. Your gastroenterologist will adjust them to what each colonoscopy finds. A schedule copied from another family, or from the internet, may be wrong for you. It also cannot tell you what your first colonoscopy will find. That depends on your age, how long polyps have had to form and whether you have been checked before.
Who this does not apply to
If your report shows one faulty copy and no close relative has had bowel cancer, most of the steps above will not apply to you. Your counsellor may simply confirm that routine screening is enough. Testing done on a tumour sample is a different test, explained on our targeted therapy pages.
Commonly believed
What do people assume after a MUTYH result?
"I tested positive, so I have cancer."
A positive result describes risk. Most people are well when they are tested, and the checks that follow are there to keep it that way.
"I carry one copy, so my children will have the syndrome."
A child needs a faulty copy from both parents to have MUTYH polyposis. If your partner does not carry MUTYH, your children can at most be carriers, like you.
"We should keep this from the family we are marrying into."
That choice is yours. Keep in mind that the partner's test is the one that tells you about your children. Many couples find it easier to share early, with a counsellor present if it helps.
"Once the checks start, they will find cancer."
Most surveillance colonoscopies find polyps or nothing at all. Removing polyps early is the whole point, and it is a routine part of the test.
Questions we are asked
Common questions after a positive MUTYH result
How soon should I have a colonoscopy?
With two faulty copies, soon, if you are an adult and have not had one recently. With one faulty copy, the timing depends on your family history and your age. Your counsellor or gastroenterologist will set the date, and it rarely has to happen within days.
Do I need a genetic counsellor, or is my oncologist enough?
Either can start the process. A counsellor has more time to draw the family tree, explain the result and plan testing for relatives. Many people see both, the counsellor for the family and a gastroenterologist or oncologist for their own checks.
Will I need surgery?
Most people with two faulty copies do not need surgery at first, because polyps are removed at colonoscopy. Surgery is discussed if there are too many polyps to manage that way, or if a cancer is found. It is one option among several.
Should my brothers and sisters be tested?
If you have two faulty copies, yes. Each brother or sister has a one in four chance of having two faulty copies too. If you have one faulty copy, testing is optional and mostly helps with their own family planning.
What about my children?
Every child of a person with two faulty copies inherits one faulty copy. Whether a child could have two depends on your partner, so testing your partner usually comes first. Children themselves are usually tested closer to adulthood.
Can my parents be tested too?
Sometimes this helps. Testing both parents can confirm that your two variants sit on different copies, which the laboratory may need to know. Parents are usually single carriers, and their own screening is guided by the family history.
Will this affect my insurance or marriage prospects?
India has no dedicated law on genetic discrimination, so ask about insurance before testing where you can. A MUTYH result is a risk marker, not an illness. How and when to tell a future spouse's family is a personal decision a counsellor can help you think through.
Where can I get help understanding my report?
Take the report, and any relatives' reports, to a genetic counsellor or your oncologist. Call the CION helpline if you are unsure where to go, and we will point you to the right clinic.
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
Medical Oncologist
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Sources
- GeneReviews (NCBI Bookshelf) — MUTYH Polyposis
- MedlinePlus Genetics — MUTYH gene
- National Cancer Institute — Genetics of Colorectal Cancer (PDQ®)–Health Professional Version
- NHS — Predictive genetic tests for cancer risk genes
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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Just been told you carry MUTYH?
Tell us what the report says, and a counsellor will explain which result you have and what comes next. If checks are needed, we will help you plan them. One helpline serves every CION centre.