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CION Cancer Clinics
What a polygenic risk score can and cannot tell you | CION Cancer Clinics
A polygenic risk score places your background genetic risk on a scale next to other people. It cannot tell you whether you will develop cancer, and it does not replace testing for a known strong gene fault. This page explains how to read your own result honestly, and what questions to ask before acting on it. At CION Cancer Clinics in Hyderabad, our oncologists review your family history with you and guide you to the right genetic counselling and testing.
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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 does a polygenic risk score actually tell you?
- What the score can tell you, and what it genuinely cannot
- How to make sense of your own polygenic score
- The words a polygenic report uses, in plain language
- Where a polygenic score fits, and where it does not belong
- What this page cannot tell you
- Four things people assume about their own score, and what is true
- Common questions about polygenic risk scores
The short answer
What does a polygenic risk score actually tell you?
It tells you roughly where your background genetic risk sits compared with other people, based on many small genetic differences added together. It does not tell you whether you will develop cancer, and it does not replace testing for a known strong gene fault.
A comparison, not a diagnosis
Think of it as a position on a scale rather than a prediction. Someone can sit above average on that scale and never develop cancer, and someone below average can still develop it. The score shifts the odds a little. It does not decide the outcome.
Why people are shown one at all
Alongside a known strong gene fault, a polygenic score can help explain part of why one carrier's estimated risk sits higher or lower than another's. That is the honest, current use. It is research-adjacent medicine, still finding its place in everyday clinics.
A polygenic score is not a stand-alone reason to change your surveillance plan. Bring it to the same counsellor who explained your main result.Reading the number honestly
What the score can tell you, and what it genuinely cannot
Most confusion about these scores comes from expecting them to answer a question they were never built to answer.
It can tell you
- Whether your background risk sits above or below average
- How that estimate combines with a known main fault, if you have one
- A rough band, not a precise personal figure
It cannot tell you
- Whether you personally will develop cancer
- When, if ever, that might happen
- Anything reliable if you were not part of the population it was built from
Relative risk vs your own risk
A score often describes risk relative to an average person. That is different from your own absolute chance of developing cancer, which also depends on age, sex and family history together.
Why the same score can mean different things
The same score in someone with a strong family history means something different from the same score in someone with none. Context changes how the number should be read.
Not sure whether this applies to you?
Ask an oncologistIf you have been given one
How to make sense of your own polygenic score
Find out what population it was built on
Ask which ancestry group the underlying research used. A score built largely on one population is a weaker fit for someone from a different background.
Ask whether it changes anything at all
Some scores are given for interest or research and are not meant to change your care. Ask directly whether this particular result is meant to influence your surveillance plan.
Put it next to your main result, not instead of it
If you also have a main gene test result, the two should be read together by the same counsellor, not treated as competing answers.
Ask what would actually change your plan
A useful question is what specific score would move your screening earlier or later. If nobody can answer that, the score is informational rather than actionable for you right now.
On your report
The words a polygenic report uses, in plain language
- Percentile
- Where your score sits compared with a reference group, expressed as a position rather than a probability of developing cancer.
- Relative risk
- How your risk compares with an average person's, rather than your actual personal chance of developing the disease.
- Absolute risk
- Your own real chance of developing a cancer, which needs age, sex and family history added to the score to mean much.
- Reference population
- The large group of people the score was built and tested against. A poor match here weakens the whole result.
- Clinical utility
- Whether a result is established enough to actually change how you are treated or screened, as opposed to being informational only.
- Validation
- Testing carried out to check whether a score performs as claimed in a given population, before it is trusted in that population.
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Side by side
Where a polygenic score fits, and where it does not belong
Reasonable use today
Not a reasonable use
One input in a specialist risk discussion
The sole basis for a surgery decision
Context alongside a known main gene fault
A substitute for testing the main gene at all
Research participation, with results explained by a counsellor
A number bought online and self-interpreted
A talking point for family screening timing
A reason to skip a doctor's assessment
Being straight with you
What this page cannot tell you
It cannot tell you what your own score means. That depends on the exact test used, the population it was validated in, and your personal and family history together, which is a conversation, not a page.
It cannot settle a family disagreement
If one relative wants to act on a score and another does not, this page cannot arbitrate that. A counsellor can lay out honestly how established the evidence is, and let each adult decide for themselves.
Who this does not apply to
Most people are never offered a polygenic score, and most who are do not need to act on it urgently. If you have not been given one by a clinician, seeking one out on your own is unlikely to change anything useful about your care today.
If you are unsure whether a score you have been offered or bought is worth acting on, call the helpline and describe it before you make any decision from it.Commonly believed
Four things people assume about their own score, and what is true
"A high score means I have the disease starting already."
A polygenic score reflects background genetic risk, not a current diagnosis. It says nothing about whether cancer is present now or ever will be.
"A low score means I don't need routine screening."
A lower score lowers one part of the picture. Age, sex and family history still apply, and routine screening advice stands unless a specialist tells you otherwise.
"These scores are exact, since they're based on so much genetic data."
The underlying data is large, but the result is still an estimate for a group, applied to one person. It carries real uncertainty, especially outside the population it was built on.
"If my score is high, preventive surgery is the obvious next step."
A score this uncertain, used alone, is not currently a basis for surgery anywhere in established practice. That decision needs a specialist assessment built on more than one number.
Questions we are asked
Common questions about polygenic risk scores
I paid for a polygenic score online. Should I trust it?
Bring it to a genetic counsellor before acting on it. Direct-to-consumer scores vary widely in quality, and the population they were validated in is not always disclosed clearly.
Does a polygenic score replace testing for BRCA or other main genes?
No. It is used alongside a main gene test where it is used at all, never instead of it. If you have a family history that suggests a strong gene fault, that test comes first.
Why does my percentile sound alarming but my counsellor seems unworried?
A high percentile against a reference group can still represent a small change in your absolute chance of developing cancer. Your counsellor is weighing the actual number, not just the position on the scale.
Are these scores accurate for Indian families?
Less accurate than for the populations they were mostly built on, since South Asian ancestry is thinly represented in current research. Ask specifically about this before relying on a result.
Can my score change if I test again later?
The genetic differences themselves do not change, but the score can be recalculated as the underlying research improves. A result from several years ago may be revised with better data.
Should my children be given a polygenic score too?
This is decided case by case with a counsellor. For most families it adds little in childhood, since it does not change immediate care and the science is still developing.
Does insurance ask about polygenic scores in India?
India has no dedicated law on genetic discrimination in insurance, for any type of genetic result. It is worth raising with your counsellor before testing, not afterwards.
Who can walk me through my specific result?
A genetic counsellor or clinical geneticist can put your score next to your family history and any main test result. 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
- MedlinePlus Genetics — What is a polygenic risk score?
- National Cancer Institute — Genetic Testing for Inherited Cancer Susceptibility Syndromes
- Cancer Research UK — Inherited cancer genes and increased cancer risk
- 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.
Keep reading
Related pages
Modifier genes and polygenic riskHow a score like this is actually builtWhy two people with the same gene fault have different outcomesThe bigger picture a score is trying to explainWhat a lifetime risk percentage actually meansReading any risk figure, not just a polygenic oneRisk assessment models: Tyrer-Cuzick, BOADICEA and ManchesterThe other tools used to estimate risk in a clinic
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Holding a polygenic score result you don't understand?
Tell us what you were given and we will help you put it in context with the rest of your history. One helpline serves every CION centre.