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CION Cancer Clinics
After a positive MLH1 result: the next few months | CION Cancer Clinics
A positive MLH1 result means you carry an inherited fault that causes Lynch syndrome. It is not a cancer diagnosis. What follows is a results appointment, a plan for regular colonoscopy, a conversation about the womb and ovaries for women, and help telling your relatives. This page walks through those first months and what can safely wait. 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
- I have tested positive for MLH1. What happens now?
- Which parts of my care will an MLH1 result change?
- What usually happens after a positive MLH1 result?
- The words you will meet, in plain language
- What to do now, and what can wait
- What people often think after a positive MLH1 result
- What this page cannot tell you
- Common questions after a positive MLH1 result
The short answer
I have tested positive for MLH1. What happens now?
A positive MLH1 result means you carry an inherited fault that causes Lynch syndrome. It is not a cancer diagnosis. Over the next few months you will have a results appointment, a plan for regular colonoscopy, and help telling your relatives. Women will also discuss options for the womb and ovaries.
Why the plan starts with the bowel
MLH1 is one of the two Lynch genes with the highest bowel cancer risk. In Lynch syndrome, a polyp can turn into a cancer faster than usual. Regular colonoscopy finds polyps early and removes them before they cause trouble. This is the single most useful thing a carrier can do.
What does not change
You are the same person you were before the result. You do not need treatment, and your daily life, work and diet can carry on as normal. The result adds checks to your calendar. It does not take anything else away.
Give yourself time. Most of what follows is planned over weeks, not days.Four areas of your care
Which parts of my care will an MLH1 result change?
The result touches four areas. Your specialist will tell you which apply to you and when each one starts.
Bowel checks
Colonoscopy from early adult life, repeated far more often than for other people. Polyps found along the way are removed during the same test.
Womb and ovaries
Women carry a raised risk of womb and ovary cancer. Options include watching for warning signs and, once a family is complete, surgery to remove the womb and ovaries. This is one choice among several.
Report quickly
- Bleeding after menopause
- Bleeding between periods
Stomach and other organs
Some carriers are offered an upper endoscopy to look at the stomach and the start of the small bowel. Whether you need it depends on your family history and your specialist's view.
If you already have cancer
The result can change the treatment plan. Tumours caused by Lynch syndrome often respond well to immunotherapy, and surgeons may suggest a different extent of bowel surgery.
Not sure whether this applies to you?
Ask an oncologistThe first months
What usually happens after a positive MLH1 result?
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The results appointment
A genetic counsellor or clinical geneticist explains the report, the exact MLH1 change and what it means for you. Bring a relative if it helps, and write your questions down beforehand.
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A referral for colonoscopy
You are referred to a gastroenterologist, who books your first colonoscopy and sets how often it should be repeated. If you have had one recently, bring the report.
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A gynaecology conversation
Women meet a gynaecologist to talk through warning signs, checks and the option of preventive surgery later on. Nothing needs deciding at the first visit.
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The family letter
You receive a letter naming the gene and the exact change. Relatives take it to their own doctor so they can be tested for the same fault.
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A written plan you can keep
You leave with a list of which checks you need and roughly when. Keep a copy of the report and the plan together, because every future doctor will ask for both.
On your report
The words you will meet, in plain language
- Lynch syndrome
- The condition caused by an inherited fault in MLH1 or one of its partner genes. It raises the risk of several cancers.
- Pathogenic variant
- A change in the gene known to stop it working. This is what a positive result means.
- Mismatch repair
- The system that fixes copying errors in DNA. MLH1 is one of its key parts, and a fault weakens it.
- Colonoscopy
- A camera test that looks at the whole large bowel. Polyps can be removed during it.
- Polyp
- A small growth in the bowel lining. Most are harmless, but some can slowly turn into a cancer if left in place.
- Surveillance
- Regular checks planned in advance, to find a problem early rather than wait for symptoms.
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Side by side
What to do now, and what can wait
Worth doing soon
Can wait until you are ready
Book the results appointment
Decisions about preventive surgery
Arrange your first colonoscopy
Testing your children, until they are adults
Share the letter with brothers and sisters
Telling the wider family and cousins
Report unusual bleeding straight away
Reading about every other Lynch organ
Commonly believed
What people often think after a positive MLH1 result
"A positive result means I have cancer."
It means your risk is raised. Many carriers never develop cancer, and those who do are often found early because they are being checked regularly.
"I feel fine, so the colonoscopy can wait."
Polyps and early bowel cancers rarely cause symptoms. Waiting to feel unwell defeats the purpose. The checks work because they happen before anything is felt.
"I must have surgery straight away."
No surgery is urgent because of a result alone. Preventive surgery on the womb and ovaries is an option for later, once a woman has finished having children, and it is always her choice.
"I did something to cause this."
You were born with it. Nothing you ate, did or avoided caused the fault, and nothing you could have done would have changed it.
Being straight with you
What this page cannot tell you
It cannot tell you what your particular MLH1 change means. Different changes in the same gene can behave slightly differently, and your family history adds more detail. The counsellor who ordered your test holds that picture and should explain it.
It cannot set your schedule
How early checks begin and how often they repeat depend on your age, your family's history and what earlier tests showed. Guidelines give a range. Your gastroenterologist chooses where you sit within it. Studies on some of the newer checks, such as stomach screening, are still small.
Who this does not apply to
If your report says variant of uncertain significance, you have not tested positive, and none of this plan should start because of it. If a tumour test showed MLH1 switched off but your blood test was normal, that is a different situation, covered on our page about promoter methylation.
What your specific variant means is a question for the counsellor who ordered the test.Questions we are asked
Common questions after a positive MLH1 result
Do I have Lynch syndrome now?
Yes. A confirmed harmful change in MLH1 is what Lynch syndrome means. The name describes a raised risk, not an illness. You can use it with every doctor you see from now on, because it changes how they look after you.
How often will I need a colonoscopy?
Far more often than other people, usually every one to two years for MLH1 carriers. Your gastroenterologist sets the exact gap based on your age and what earlier checks found. It is unpleasant but short, and it is the check that matters most.
Should I take aspirin?
A large trial found that regular aspirin lowered bowel cancer risk in people with Lynch syndrome. It is not right for everyone, because aspirin can cause bleeding. Discuss it with your doctor before starting, and never begin it on your own.
Can I still have children?
Yes. Each child has a one in two chance of inheriting the fault. Some couples want to discuss testing during pregnancy or before it, and a counsellor can explain those options without pressure. Many carriers choose to have children in the usual way.
Do I need to change my diet?
No special diet changes the fault. The same advice that helps everyone also helps you: stay active, avoid tobacco, limit alcohol, and eat plenty of fibre. These habits help, but they do not replace regular colonoscopy.
Will this affect my insurance?
India has no dedicated law on genetic discrimination in insurance. Existing policies are generally worth keeping in place. Before buying new cover, ask your counsellor how to answer the questions honestly, and read the proposal form carefully.
Who should I tell first?
Your brothers, sisters and parents, then adult children. Each has a one in two chance of carrying the same fault. The family letter makes it easier, because they can take it straight to their own doctor.
What symptoms should I watch for?
Blood in your stool, a lasting change in bowel habit, unexplained weight loss, or for women, unusual vaginal bleeding. None of these means cancer on its own, but in a carrier each one deserves a prompt check rather than waiting for the next planned test.
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)
- MedlinePlus Genetics — Lynch syndrome
- MedlinePlus Genetics — MLH1 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
Surveillance for MLH1 carriersThe full list of checks and when they startTesting the family for MLH1Who to tell, and how their test worksMLH1 carriers have the highest Lynch risksWhy your plan is more intensive than other Lynch genesAspirin for Lynch syndromeWhat the evidence shows before you ask your doctor
Talk to us
Just received a positive MLH1 result?
Bring your report and we will help you plan the next steps, from the first colonoscopy to the family letter. Nobody will rush you into a decision. One helpline serves every CION centre.