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Myth: a positive genetic test means you will definitely get cancer | CION Cancer Clinics
A positive genetic test does not mean you will get cancer. It means you carry an inherited fault that raises your risk of certain cancers, sometimes by a great deal, sometimes modestly. Many carriers never develop cancer at all. This page explains what positive actually means, why families hear it as a diagnosis, and what a known risk lets you do that a hidden one does not. At CION Cancer Clinics, our team helps carriers and their families plan checks, next steps and support after a genetic result.
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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
- Does a positive genetic test mean you will get cancer?
- What a positive result does and does not tell you
- What usually happens after a positive result?
- The words on a positive report, in plain language
- What families hear, and what the result actually says
- What this page cannot tell you
- Four beliefs that travel with this one
- Common questions about a positive genetic result
The short answer
Does a positive genetic test mean you will get cancer?
No. A positive result means you carry an inherited gene fault that raises your chance of certain cancers above that of other people your age. It does not mean cancer has started, and it does not mean cancer will ever start. Many people who carry a fault live full lives without developing the cancers it is linked to.
What positive actually means on a report
A germline report looks at the genes you were born with, in every cell. Positive means the laboratory found a variant known to break one of those genes. The report calls it pathogenic or likely pathogenic. It is a statement about risk. It says nothing about whether you have cancer today.
Why the word frightens people
In most of medicine a positive test means a disease is present. A positive dengue test means you have dengue. Families carry that meaning across and hear a diagnosis. Genetic testing uses the word differently, and nobody explains that at the lab counter.
What happens next is partly in your hands
A risk that is known about can be watched. Checks can start earlier, and some people choose medicines or surgery to lower it further. The value of finding out is that the risk is no longer hidden.
A positive result changes your plan. It does not change your diagnosis.Four things at once
What a positive result does and does not tell you
Four things are true together. Families usually hear only the first one.
It confirms a raised risk
The fault you carry has been linked to certain cancers in many families studied over many years. Your chance of those cancers is higher than for someone without it.
Usually means
- Screening may start younger
- Extra tests may be added
- Relatives can be offered the same test
It does not say when, or whether
A result carries no date. It cannot tell you whether cancer would appear at forty, at seventy or never. Nobody reading your report can tell you that, and anyone who claims to is guessing.
The size of the risk depends on the gene
Some faults raise risk a great deal. Others raise it only modestly, closer to what a strong family history alone would suggest. Two people who are both positive can be in very different situations.
Ask which gene, and which cancers it is linked to. The word positive on its own tells you very little.Your own life shapes the rest
Your age, your sex, the pattern of cancer in your family, past treatment and habits such as tobacco all shift the picture. A counsellor weighs these together before estimating your own risk.
Not sure whether this applies to you?
Ask an oncologistThe months after a result
What usually happens after a positive result?
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A result session with a counsellor
The result is explained in person, in the language you are most comfortable in. You learn which gene is involved, which cancers it is linked to and roughly where your own risk sits.
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A plan for watching you closely
For most carriers the first step is surveillance. That means regular checks designed to find any cancer early, when treatment tends to work best. The type of check and how often depend on the gene.
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A conversation about lowering the risk
For some genes there are medicines or preventive surgery that reduce risk further. These are options to think about over time. Many people decide later, and some decide against them.
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Letting relatives know
Brothers, sisters and grown children can be offered a test for your exact fault. Those who test negative can usually step back from the extra screening altogether.
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Coming back as things change
Advice shifts with your age, with new evidence and with events in the family. A carrier plan is reviewed over the years rather than set once.
On your report
The words on a positive report, in plain language
- Pathogenic
- A variant known to break the gene. It is treated as a real fault.
- Likely pathogenic
- Very probably breaks the gene. In practice it is usually managed the same way as pathogenic.
- Penetrance
- How often a fault leads to cancer across everyone who carries it. It is never everyone, and it differs from gene to gene.
- Lifetime risk
- The chance of a given cancer over a whole life. It is an average across many carriers, not a forecast for you.
- Carrier
- Someone with an inherited fault who does not have cancer. A carrier is not a patient.
- Surveillance
- Planned, regular checks that aim to catch cancer early. It does not stop cancer forming. It finds it sooner.
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Side by side
What families hear, and what the result actually says
What families often hear
What the result actually says
You have cancer in your genes
You carry a fault that raises risk
It is only a matter of time
It may never happen at all
Nothing can be done about it
Screening and risk-lowering options exist
Your children will get it too
Each child may or may not have inherited it, and can be tested
Being straight with you
What this page cannot tell you
It cannot tell you your own risk. That depends on the exact gene, the exact variant, your age and your family's history, and it is worked out by a genetic counsellor or clinical geneticist with your report in front of them. What your specific variant means is a question for the counsellor who ordered the test.
It is not saying the risk is small
This page corrects the belief that cancer is certain. A raised risk is still a real risk. It is not a reason to skip the checks your plan recommends, and for some genes the risk is high enough that doctors discuss preventive surgery seriously.
Who this does not apply to
If your report says variant of uncertain significance, you do not have a positive result, and this page does not describe you. If a test was done on tumour tissue to choose a medicine, that is a different kind of test, explained on our targeted therapy pages. And most people never need a germline test at all.
If you hold a positive report and nobody has sat down with you to explain it, call the helpline and ask for a genetic counselling appointment.Commonly believed
Four beliefs that travel with this one
"My mother got cancer with this fault, so I will too, at the same age."
Relatives with the same fault often have very different lives. One is diagnosed young, another late, another never. Chance, other genes and life circumstances all play a part, and your mother's age at diagnosis is not a date set for you.
"Carriers who stay well simply have not got it yet."
Many carriers stay well for their whole lives. Penetrance is never complete, which means some people with a fault never develop the cancers linked to it at all.
"Preventive surgery is the only sensible answer."
It is one option among several. Many carriers choose close surveillance, some take risk-lowering medicines and others decide on surgery later. The right choice depends on the gene, your age and what matters to you.
"If I never test, the risk stays away."
The fault is present from birth whether or not anyone looks for it. Not testing only means nobody can plan around it, and your relatives lose the chance of a clear answer too.
Questions we are asked
Common questions about a positive genetic result
If I carry a BRCA fault, will I definitely get breast cancer?
No. A BRCA fault raises the chance of breast and ovarian cancer well above that of the general population, but many carriers never develop either. Your own risk depends on which of the two genes is involved, your age and your family history. Your counsellor can put that into plain terms for you.
Why did my aunt get cancer with the same fault when my mother did not?
Because a fault supplies only part of the story. A second change has to happen in a cell during life, and that is partly chance. Other genes, hormones, pregnancies and habits also play a part. Two sisters with the same fault can have very different lives.
Does a positive result mean I need treatment now?
No. A carrier without cancer does not need cancer treatment. You will usually be offered earlier or more frequent checks, and later a conversation about ways to lower the risk. Nothing has to be decided on the day you get the result.
Can the risk from a positive result be lowered?
For many genes, yes. Regular surveillance finds cancer earlier, when it is easier to treat. Some genes also have risk-lowering medicines or preventive surgery. None of these changes the gene itself, and the right mix differs from person to person.
Should I tell my brothers and sisters?
It usually helps them. Each of them can be tested for your exact fault, which gives a clear yes or no. Those who test negative can often drop extra screening. Your counsellor can give you a family letter that explains the result so you do not have to find the words alone.
Is likely pathogenic the same as pathogenic?
Not quite, but it is usually managed the same way. Likely pathogenic means the evidence strongly suggests the variant breaks the gene, though it has not yet reached the highest level of certainty. Your counsellor will say whether anything in your plan differs because of that.
Will my risk estimate change over time?
It can. As you pass through the ages when a cancer is most common without developing it, your remaining risk falls. New research also refines the estimates for each gene. That is one reason a carrier plan is reviewed from time to time.
Can I have my result explained in Telugu?
Ask for it. A result explained in the language you think in is far easier to act on, and family members who come with you will follow it better too. Call the CION helpline if you are not sure who to approach, and someone 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
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Sources
- National Cancer Institute — Genetic Testing for Inherited Cancer Susceptibility Syndromes
- MedlinePlus Genetics — What are reduced penetrance and variable expressivity?
- NHS — Predictive genetic tests for cancer risk genes
- Cancer Research UK — Inherited cancer genes and increased cancer risk
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
Myth: a negative test means you are safeThe mirror-image mistake, and what a negative result really rules outMyth: knowing will only cause worryWhat people actually feel after a result, and how it changesMyth: a gene fault can be reversed or correctedWhy the fault stays, and what can still be done about the riskMyths about inherited cancerEvery common belief on one page, with what is actually true
Talk to us
Holding a positive result nobody has explained?
Tell us which gene your report names and who in the family is affected. We will arrange a counsellor to explain what it means for you and what to do next. One helpline serves every CION centre.