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Genetics Explained · Reviewed by CION Oncologists · NABH Accredited
Lynch Syndrome and Your Family — Who Should Be Tested
Being told you have Lynch syndrome is, for most women, less frightening for themselves than for their children. That reaction is understandable and it is also worth reframing. This is one of the very few cancer results that can protect other people. Each of your parents, siblings and children has a one-in-two chance of carrying the same variant — and the ones who do can now be found while they are well, and offered surveillance that genuinely prevents cancers rather than treating them. A relative identified this way may never develop the disease you did. That is what this information is for.
- One in two for each close relative — parents, brothers, sisters, sons and daughters
- Men carry and pass it on too — and are at raised risk of bowel cancer themselves
- Testing relatives is simple and definitive — once the family variant is known, it is a clear yes or no
- A positive result before any cancer is the goal — surveillance prevents rather than detects
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How It Is Inherited — and Who Is Affected
Lynch syndrome follows a straightforward inheritance pattern, and understanding it makes the list of who to tell obvious.
You carry two copies of each mismatch repair gene, one from each parent. In Lynch syndrome one copy carries a fault. When you have a child, you pass on one of your two copies at random — so each child has a one-in-two chance of inheriting the faulty one.
- Each first-degree relative has a 50% chance. Parents, brothers, sisters, sons and daughters. Not “some of them” — each one independently, like a coin toss for each person.
- It does not skip generations. A person who does not carry the variant cannot pass it on. If your sister tests negative, her children are not at risk through her and do not need testing.
- Sex makes no difference to inheritance. Men inherit it and transmit it at exactly the same rate. What differs is which cancers they are at risk of.
- It came from one of your parents. Which means that side of the family — aunts, uncles, cousins — may also be affected. Genetics services usually work outwards from the closest relatives first.
One point worth stating plainly: you did not do anything to cause this and you did not give it to anyone. A gene variant present since your own conception, inherited from a parent who did not know they carried it, is not something anyone chose. Guilt is a near-universal reaction here and it is entirely misplaced.
Did You Know? The relatives most often overlooked in a Lynch family are the men. A male carrier cannot develop endometrial cancer, so the family history on his side can look entirely unremarkable — and yet he carries a substantially raised risk of bowel cancer himself, and passes the variant to half his children regardless of their sex. Families frequently trace the condition down the female line because that is where the womb cancers are visible, and miss a branch entirely. When you are working out who to tell, brothers, sons, fathers and uncles belong on the list for their own sake as much as for their children’s. Sources: NCCN Clinical Practice Guidelines in Oncology — Genetic/Familial High-Risk Assessment: Colorectal, Endometrial and Gastric; ESGO–ESTRO–ESP guidelines for the management of patients with endometrial carcinoma.
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Who to Tell, and Why Each Person
Roughly in order of priority. Genetics services normally test outwards from the closest relatives, and there is no need to contact everyone at once.
| Relative | Why they need to know |
|---|---|
| Adult children | Each has a one-in-two chance. If positive, surveillance can begin at the age recommended for their gene, often well before any risk becomes significant. This is the group where prevention has the most years to work. |
| Brothers and sisters | Same one-in-two chance, and often at an age where bowel screening would already be beneficial. Brothers matter as much as sisters — colorectal risk is substantial in men and easily forgotten. |
| Parents | One of them almost certainly carries it. Identifying which side directs testing to that half of the extended family and often explains a history nobody had connected. |
| Aunts, uncles and cousins on the affected side | Once the side is known, these relatives can be offered testing. Usually approached after first-degree relatives, and often via the family member closest to them. |
| Children who are still minors | Testing is generally deferred until adulthood, because surveillance does not begin in childhood and the decision is regarded as theirs to make. Worth discussing with the genetics service rather than deciding alone. |
You do not have to do this unaided. Genetics services routinely provide a family letter — a document explaining the finding, what it means, and how a relative can arrange testing. You can pass it on rather than attempting to explain the genetics yourself, which relieves a great deal of the pressure that makes people put this off.
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It is one of the harder conversations, and you do not have to have it alone or explain the genetics yourself.
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This Is a Result That Can Protect Other People
A relative found while well, and entered into surveillance, may never develop the cancer you did.
What Testing Involves for a Relative
Considerably simpler than the testing you went through, because the hard part — finding the variant — has already been done.
- The test is targeted at one known change. The laboratory is not searching whole genes; it is looking for the specific variant identified in your family. Faster, cheaper and definitive.
- The result is a clear yes or no. No variants of uncertain significance, because the change being looked for has already been classified. This is the one part of this field where the answer is genuinely binary.
- A negative result means population risk. A relative who does not carry the family variant is at no more risk than anyone else, needs no extra surveillance, and cannot pass anything on to their children. This is a substantial relief and it is a real product of the process.
- A positive result means surveillance, not treatment. They do not have cancer. They have information, and a schedule. See surveillance with Lynch syndrome.
Relatives are seen through genetic counselling in the same way you were, so the implications are explained to them properly rather than second-hand. See what genetic counselling involves and the testing process.
Want Help Arranging Testing for Relatives?
We can provide a family letter and arrange counselling for the relatives who want it. The opinion is free.
What a Relative Who Tests Positive Is Offered
None of this is treatment. All of it is prevention, and it is why the testing is worth doing.
Everyone
Regular Colonoscopy
From a younger age and at shorter intervals. The single highest-value intervention in Lynch syndrome, because polyps can be removed before they ever become cancers. See colon cancer and rectal cancer.
Women
Endometrial Surveillance
Education about reporting bleeding immediately, and consideration of periodic sampling and ultrasound from a defined age. See surveillance.
Women
Risk-Reducing Surgery Discussed
Hysterectomy with removal of tubes and ovaries once childbearing is complete, as an option rather than an expectation. See risk-reducing hysterectomy.
Everyone
Awareness of Other Cancers
Gastric, urinary tract and other cancers occur at raised frequency, which changes which symptoms get investigated and how quickly.
Everyone
Preventive Options
Including areas of active research into medication to reduce cancer risk in carriers. See preventing cancer with Lynch syndrome.
Next generation
Information for Their Own Children
Each of their children has the same one-in-two chance, and can be tested in adulthood. The cascade continues outward from every positive result.
Why the Family Side Needs Real Support
The hardest part of a Lynch diagnosis is rarely the medicine. It is the conversation, and that deserves help.
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You Did Not Give This to Anyone
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Common questions
Lynch Syndrome & Your Family — Frequently Asked Questions
Should my family be tested if I have Lynch syndrome?
Yes — testing should be offered to your first-degree relatives, meaning your parents, brothers, sisters, sons and daughters. Each of them has a one in two chance of carrying the same variant, independently of one another. Once your specific variant is known, testing them is far simpler than the testing you underwent: the laboratory looks for one identified change rather than searching whole genes, so the result comes back faster and is a clear positive or negative with no uncertain outcomes. Relatives who test negative are at population risk and need no additional surveillance; those who test positive can enter surveillance while entirely well, which is where the benefit lies.
What is the chance my children have inherited it?
One in two for each child, independently. Lynch syndrome is inherited in an autosomal dominant pattern: you carry two copies of each mismatch repair gene, one of which has a fault, and each child receives one of your two copies at random. It is a separate coin toss for each child, so having three children does not mean roughly half are affected — all three could carry it, or none. Sex makes no difference to inheritance: sons are as likely to inherit it as daughters, and can pass it on equally. It also does not skip generations, so a child who tests negative cannot transmit it to their own children.
Do my brothers and sons need to know? They cannot get endometrial cancer.
Yes, and they are the relatives most often overlooked. A man with Lynch syndrome carries a substantially raised lifetime risk of colorectal cancer, which is preventable through regular colonoscopy because polyps can be removed before they become cancers — so the information has direct value for his own health. He also passes the variant to half his children regardless of their sex. Families frequently trace Lynch syndrome down the female line because that is where the womb cancers are visible, and miss an entire branch descending through a male carrier whose own family history looks unremarkable.
How do I tell my family without frightening them?
You do not have to explain the genetics yourself, which is the part most people dread. Genetics services routinely provide a family letter — a written document setting out what has been found, what it means, and how a relative can arrange testing through their own doctor or a genetics service. You can pass that on rather than attempting the explanation. It also helps to lead with what the information is for: this is not news that someone has a disease, it is an opportunity for them to find out whether they need screening that prevents cancers. Many relatives will test negative and be reassured permanently.
Should my children be tested now, while they are young?
Generally not until adulthood. Surveillance for Lynch syndrome does not begin in childhood — colonoscopy and gynaecological surveillance start in adult life — so testing a child produces information that cannot be acted on for many years. The prevailing view is that the decision belongs to the person themselves once they are old enough to make it, weighing what they want to know against how they want to live with the knowledge. That said, it is worth discussing with your genetics service rather than deciding alone, and it is helpful for your children to know the family history exists so they can seek testing when they choose to.
Medical disclaimer: This page explains the family implications of Lynch syndrome in general terms and is reviewed by a CION oncologist, following current NCCN guidance on genetic and familial high-risk assessment. It is general health information rather than advice about your own family. Testing of relatives should be arranged through genetic counselling, which is also where decisions about testing children should be discussed.