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CION Cancer Clinics
RUNX1 in the family: who should be tested and in what order | CION Cancer Clinics
Once an inherited RUNX1 fault is confirmed in one person, their parents, brothers, sisters and children can each be tested for that exact variant. Each has a one in two chance of carrying it if their parent does. Unlike many adult cancer genes, RUNX1 testing is often offered to children too. This page explains who to test, how it works and what each result means. 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. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- Who in the family should be tested for RUNX1?
- What does testing mean for each relative?
- How does family testing actually work?
- The words you will meet, in plain language
- What a positive or negative family result means
- Four things families tell us, and what is actually true
- What this page cannot tell you
- Common questions about testing the family for RUNX1
The short answer
Who in the family should be tested for RUNX1?
Start with the closest blood relatives of the person whose inherited RUNX1 fault has been confirmed: parents, brothers and sisters, and children. Each is tested for that one family variant, not a full panel. Testing then moves outward, one branch at a time, to whoever turns out to carry it.
Why the family variant matters
Once the exact spelling change is known, a relative's test only has to answer one question. Do they carry this change or not? That makes the test simpler, usually cheaper and quicker to report than the full gene panel the first person had.
Why RUNX1 is different from many adult genes
For genes that raise risk only in adult life, testing children is usually delayed. RUNX1 is different. It can cause low platelets and bleeding from childhood, and leukaemia can appear young. Knowing early helps a child's doctors plan safely.
Why it also matters for transplant
If anyone in the family ever needs a stem cell transplant, relatives offered as donors must be tested first. A family that has already been tested is ready for that decision.
Each relative decides for themselves. Nobody is tested without their own consent, or a parent's consent for a child.Relative by relative
What does testing mean for each relative?
A RUNX1 fault is passed on in a dominant pattern. Each child of a carrier has a one in two chance of inheriting it.
Parents
Testing both parents shows which side the fault came from. That tells you which aunts, uncles and cousins to think about next. If neither carries it, the fault probably arose fresh.
Brothers and sisters
Each has an even chance of carrying it if a parent does. They are often also the first stem cell donors the team considers.
Children
Testing is often offered in childhood because the condition can affect a child directly.
What a result changes
- Blood counts watched from a young age
- Safe planning for dental work and surgery
- Avoiding treatment for the wrong platelet condition
Wider family
Aunts, uncles and cousins on the carrying side come next. Relatives with lifelong low platelets or a history of leukaemia are the most important to reach.
Not sure whether this applies to you?
Ask an oncologistStep by step
How does family testing actually work?
Confirm the first result is inherited
If the first person has leukaemia, their fault must be confirmed on skin or hair, not blood. Blood from leukaemia can carry faults that were never inherited.
Get a copy of the report
Relatives need the exact variant written on it. Without it, their laboratory has to start from scratch.
Counselling before the sample
Each relative talks through what a positive or negative result will mean for them, their marriage plans and their children.
A simple sample
For a well relative, a blood or saliva sample is usually enough. It can often be collected close to home.
Results and next steps
Results are given in person or by phone with the counsellor. A positive result leads to a haematologist and a surveillance plan.
On the family report
The words you will meet, in plain language
- Cascade testing
- Testing relatives one step at a time, starting with the closest, and moving outward only through those who carry the fault.
- Family variant
- The exact RUNX1 change found in your family. It is the only thing a relative's test looks for.
- Index case
- The first person in the family found to carry the fault. Their report is the starting point for everyone else.
- De novo
- A fault that appeared for the first time in one person and was not inherited from either parent.
- Pedigree
- A family tree drawn by the counsellor, marking who had low platelets, bleeding or blood cancer, and at what age.
- Carrier
- A relative who has the fault. A carrier is not a patient, but needs regular blood checks.
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Side by side
What a positive or negative family result means
Relative carries the variant
Relative does not carry it
Referred to a haematologist for surveillance
No extra blood checks needed for this fault
Their children may need testing
Their children cannot inherit it from them
Not a stem cell donor for a relative
Can be considered as a donor if matched
Needs a bleeding plan for procedures
Low platelets need another explanation
Commonly believed
Four things families tell us, and what is actually true
"Only the women in the family need testing."
RUNX1 is not linked to sex. Fathers pass it on as often as mothers, and sons are affected as often as daughters.
"Talking about it will ruin our children's marriage prospects."
This fear is real in many Indian families. A result is private medical information. A counsellor can help you decide who needs to know, and when, without the whole community finding out.
"If my test is negative, my children should be tested anyway."
If you do not carry the family variant, you cannot pass it on. Your children do not need testing for it.
"We married within the family, so everyone must carry it."
A marriage between relatives does not change how a single dominant fault is passed on. It does make a careful family tree more important, because one relative can sit on several branches.
Being straight with you
What this page cannot tell you
It cannot tell you which of your relatives carry the fault, or what a particular result means for them. What your specific variant means is a question for the counsellor who ordered the test. They will draw your family tree and suggest an order that fits your family.
When the first result is uncertain
If the first report says variant of uncertain significance, meaning the laboratory cannot yet say whether the change matters, relatives are usually not tested to predict their own risk. Sometimes affected relatives are tested to help the laboratory decide, but that is a research question, not a prediction.
Who this does not apply to
Family testing applies only when an inherited RUNX1 fault is confirmed. If the RUNX1 fault was found only in leukaemia cells, relatives do not need this test. Most people with a relative who had leukaemia do not need genetic testing at all.
Relatives abroad or in distant districts can often be counselled by phone and tested at a local laboratory.Questions we are asked
Common questions about testing the family for RUNX1
Who should be tested first?
After the first person, their parents, brothers, sisters and children. Testing the parents first can save effort, because it shows which side of the family the fault is on. Your counsellor will suggest an order.
Should young children be tested?
Often, yes, because RUNX1 can affect a child's platelets and bleeding and leukaemia can appear young. The decision is made with the parents and a paediatric haematologist. It is not rushed, and it is revisited if parents want time.
Can relatives use a saliva sample?
A well relative can usually give blood or saliva. Someone who has or had a blood cancer, or has had a stem cell transplant, needs a skin or hair sample instead. Their blood may not reflect what they were born with.
Is the test expensive for relatives?
Testing for one known variant usually costs much less than a full panel. Ask for an estimate before samples are sent, and whether any scheme applies. Some laboratories offer lower rates for family testing.
What if a relative refuses to be tested?
That is their right. They can still be offered regular blood counts based on the family history alone. The door stays open, and many relatives come back later, often when they are planning a family.
Do I have to tell my relatives?
No one can force you. It is the only way they can protect themselves and their children, though. Counsellors can give you a short family letter explaining the result, so you do not have to find the words alone.
Will the result affect insurance?
India has no dedicated law protecting people from genetic discrimination in insurance. Raise this with your counsellor before testing. Some families arrange cover first, and the counsellor can explain what you may be asked to declare.
Can counselling be done in Telugu?
Yes. The family tree conversation and the results can be explained in Telugu. Several relatives can join the same session, which helps when the news needs to travel through a large family.
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)
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Medical Oncologist
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Sources
- GeneReviews (NCBI) — RUNX1 Familial Platelet Disorder with Associated Myeloid Malignancies
- National Cancer Institute (PDQ) — RUNX1-Familial Platelet Disorder (PDQ)
- MedlinePlus Genetics — What does it mean if a disorder seems to run in my family?
- 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
Why a RUNX1 result changes who can be a stem cell donorWhy relatives offered as donors are tested firstSurveillance for RUNX1 carriersWhat happens next for a relative who tests positiveThe RUNX1 gene: what it doesThe gene itself, explained for the whole familyLow platelets running in a familyWhen a family pattern of low platelets is worth checking
Talk to us
Not sure which relatives to test first?
Share the first RUNX1 report and a rough family tree. We will help you work out an order and arrange counselling for relatives, including those in the districts. One helpline serves every CION centre.