Medical Oncologist
CION Cancer Clinics
Testing the family for CEBPA, DDX41, ETV6 and ANKRD26 | CION Cancer Clinics
When a fault in CEBPA, DDX41, ETV6 or ANKRD26 is confirmed in one person, parents, brothers, sisters and children can be offered a test for that exact fault. The result tells them whether they need regular blood checks, and whether a sibling can safely donate stem cells. This page explains who is tested, in what order, with which sample, and what each result changes. 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, and why?
- Does family testing differ between the four genes?
- How does testing move through the family?
- What do the words on a relative's report mean?
- What does a relative's result change?
- What this page cannot tell you
- Four things families assume, and what is actually true
- Common questions about testing the family
The short answer
Who in the family should be tested, and why?
Blood relatives of someone with a confirmed inherited fault can be tested for that one fault. Each parent, brother, sister and child has a one in two chance of carrying it. The test itself is simple. What it decides is not: who needs regular blood checks, and who can safely give stem cells.
First, confirm the fault really is inherited
In blood cancer, a change in one of these four genes is often first spotted on a test of the leukaemia itself. That test cannot tell an inherited fault from one that arose only in the cancer cells. Before any relative is tested, the fault has to be confirmed in a sample with no cancer cells in it. In a person with leukaemia that usually means a small skin sample, because blood and saliva both carry blood cells.
Why this family question is more urgent than most
Leukaemia treatment sometimes needs a stem cell transplant, and the first donor anyone looks at is a brother or sister. A sibling who carries the same fault is not a suitable donor, even if they feel perfectly well. That is why family testing in these genes often happens while treatment is still under way.
A relative can only be tested once the family fault is known. Without it, there is nothing specific to look for.Gene by gene
Does family testing differ between the four genes?
The method is the same for all four. What differs is how the fault usually comes to light, and whether children are included.
CEBPA
An inherited CEBPA fault carries a high chance of acute myeloid leukaemia, and it can appear in children and young adults. Because the illness can start young, a counsellor may discuss testing children earlier than for most genes.
DDX41
The most common of the four. Leukaemia or myelodysplasia, a bone marrow disorder that can turn into leukaemia, usually appears in later adult life and more often in men. Many carriers have no family history, so children are rarely tested.
ETV6
Usually shows up first as a low platelet count from childhood, with easy bruising or nosebleeds. It also raises the risk of blood cancers, including a childhood leukaemia.
Clues in the family
- A low platelet count nobody explained
- Heavy periods or nosebleeds since childhood
ANKRD26
Also causes a lifelong low platelet count, often mistaken for an immune platelet problem and treated as one. The risk of a myeloid blood cancer is raised, although most carriers never develop one.
Not sure whether this applies to you?
Ask an oncologistIn order
How does testing move through the family?
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Confirm the fault in the person who is ill
A germline test, meaning a test for a fault present from birth, is run on a skin sample or sometimes on hair roots. Only then does it make sense to test anyone else.
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Draw the family tree
A genetic counsellor maps both sides of the family, noting low platelet counts, unexplained bruising, leukaemia and bone marrow problems. This shows who is at one in two risk.
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Tell the relatives
The person who tested positive usually passes on the news, often with a written family letter. Relatives in a district or another state can give a sample locally and have it sent on.
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Test the closest relatives first
Parents, brothers, sisters and adult children are offered a test for the one known fault. A sibling being considered as a stem cell donor is tested before any collection is arranged.
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Plan around each result
A relative who carries the fault gets a baseline blood count and a plan with a haematologist. A relative who does not carry it has no extra risk from this fault.
On the report
What do the words on a relative's report mean?
- Germline
- Present in every cell from birth, so it can pass to children. This is the kind of fault family testing looks for.
- Somatic
- Found only inside the cancer cells. It cannot be inherited, and relatives do not need testing for it.
- Single-site test
- A test that looks only for the one fault already found in the family. It is simpler than the first test and usually costs less.
- Skin fibroblast sample
- A small piece of skin grown in the laboratory, used when blood or saliva may contain cancer cells.
- Related donor
- A brother, sister, parent or child offering stem cells for a transplant. They are checked for the family fault first.
- Carrier
- Someone who has the fault but is well. A carrier needs watching, not treatment.
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Side by side
What does a relative's result change?
The relative carries the fault
The relative does not carry it
Regular blood counts, planned with a haematologist
No extra monitoring for this fault
Not a suitable stem cell donor for the family member
Can be considered as a donor if otherwise a match
Their own children may need testing later
Their children cannot inherit it from them
Unexplained bruising or infections are checked quickly
Ordinary advice for age and health applies
Being straight with you
What this page cannot tell you
It cannot tell you whether a particular relative carries the fault. Only their own test can. It also cannot explain the exact change on your family's report. What your specific variant means is a question for the counsellor who ordered the test.
It cannot give you the size of anyone's risk
Risk differs between these four genes, and even between two variants in the same gene. Studies so far are small, and published figures shift as more families are found. A haematologist or genetic counsellor will give you the current picture for your family's variant.
Who this does not apply to
Most people with leukaemia do not have an inherited fault, and their relatives do not need testing. If a change was found only in the cancer sample and a skin test showed it was not inherited, this page does not apply to your family. Changes found only in the tumour are covered on our targeted therapy pages.
In families where parents are related by blood, a counsellor will look carefully at both sides of the tree before deciding who to test.Commonly believed
Four things families assume, and what is actually true
"My brother is healthy, so he is the best donor."
Feeling well says nothing about carrying the fault. A sibling who carries it should not donate to the family member, so donors are tested for the family fault before collection.
"Nobody else in the family had leukaemia, so it cannot be inherited."
With DDX41 in particular, many carriers have no family history at all. The illness tends to appear late in life, so relatives who carried it may never have been ill.
"A low platelet count is just how our family is."
Sometimes it is harmless. In ETV6 and ANKRD26 families it is the first sign of the fault, and it deserves a proper look by a haematologist rather than a shrug.
"If I test positive, leukaemia is certain."
A fault raises risk. It does not settle the matter. Many carriers stay well, and those who are watched have problems picked up earlier.
Questions we are asked
Common questions about testing the family
Why can't my relative with leukaemia just give a blood sample?
Their blood contains leukaemia cells, and saliva contains blood cells too. A fault seen there might belong only to the cancer. A small skin sample, grown in the laboratory, shows what was present from birth. Well relatives can usually give an ordinary blood or saliva sample.
Who should be tested first?
The person who is ill, to confirm the fault is inherited. After that, any brother or sister being considered as a stem cell donor, then parents and adult children. Your counsellor will set the order around your family's treatment plans.
Can a sibling who carries the fault still donate stem cells?
Usually not to the family member with the fault. Donated stem cells would carry the same fault into the recipient, and leukaemia arising from donor cells has been reported. The transplant team will look for another related or unrelated donor instead.
Should our children be tested?
It depends on the gene. For DDX41, where illness belongs to later life, testing usually waits until the child is an adult. For CEBPA, ETV6 and ANKRD26, earlier testing may be discussed because problems can start in childhood. Your counsellor will advise on your family.
What does a carrier's monitoring involve?
Usually a baseline full blood count and review with a haematologist, then regular checks after that. How often depends on the gene and the person. Our surveillance page for these genes explains the plan in more detail.
My relative lives in a district far from Hyderabad. Can they still be tested?
Yes. A blood or saliva sample can often be collected locally and sent to the laboratory. Counselling can be done by video call, in Telugu. They do not need to travel unless the result shows they need a haematology review.
Will testing affect a relative's marriage prospects?
It is a real worry in many families. A result is private medical information and belongs to the person tested. Whether and when to share it with a future spouse is their choice, and a counsellor can help them think it through before testing.
What if a relative does not want to be tested?
That is their right. Nobody should be pressured. Give them the family letter and let them decide in their own time. If they later become a possible donor or develop symptoms, the option is still open.
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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Sources
- GeneReviews (NCBI) — CEBPA-Associated Familial Acute Myeloid Leukemia (AML)
- MedlinePlus Genetics — ETV6 gene
- MedlinePlus Genetics — ANKRD26 gene
- National Cancer Institute — Genetic Testing for Inherited Cancer Susceptibility Syndromes
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
CEBPA, DDX41, ETV6 and ANKRD26: what the genes doWhat each of the four genes does in the bloodSurveillance for CEBPA, DDX41, ETV6 and ANKRD26 carriersWhat monitoring a relative who tests positive can expectWhy adult-onset leukaemia can still be inheritedWhy a late diagnosis does not rule out a family faultWhat to send a relative: the family letterHow to pass the news on in writing
Talk to us
Does someone in your family need testing for the fault?
Tell us which gene was found and who in the family is involved. We can arrange genetic counselling, including in Telugu, and help plan who is tested first. One helpline serves every CION centre.