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Inherited predisposition to leukaemia and MDS, explained | CION Cancer Clinics
Most leukaemia and MDS is not inherited. It comes from faults that build up in the bone marrow over one person's lifetime. In a small number of families, a gene fault present from birth raises the risk, and lifelong low platelets are sometimes the first clue. This page explains what that means, how it is found, and why it changes donor choice and advice for relatives. At CION Cancer Clinics, our oncologists plan screening and care for families with an inherited cancer syndrome, explained in plain words.
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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
- What does an inherited predisposition to leukaemia mean?
- Which inherited conditions raise the risk of blood cancer?
- How does a doctor work out whether a blood cancer is inherited?
- The words you will meet, in plain language
- What finding an inherited fault changes
- Four things families tell us, and what is actually true
- What this page cannot tell you
- Common questions about inherited blood cancer risk
The short answer
What does an inherited predisposition to leukaemia mean?
It means a person was born with a gene fault that makes blood cancer more likely than usual. The fault is in every cell of the body, not only in the bone marrow, and it can be passed from parent to child. Most leukaemia and MDS is not like this. It comes from faults that build up in the marrow during one person's life.
What MDS is, in one line
MDS, or myelodysplastic syndrome, is a condition where the bone marrow makes blood cells that do not grow up properly. The counts fall, and in some people MDS moves on to acute myeloid leukaemia, called AML. Both are cancers of the cells that make blood.
Why doctors now ask about it
For a long time blood cancers were assumed to be almost entirely acquired. Better testing has shown that a real minority of patients carry an inherited fault, including some adults diagnosed late in life. The World Health Organization now lists blood cancers with an inherited predisposition as their own group. Knowing changes which relative can safely donate stem cells, how some treatment is planned, and who else in the family should have their blood counts checked.
An inherited predisposition is a statement about risk. It is not a diagnosis of leukaemia.The main groups
Which inherited conditions raise the risk of blood cancer?
Doctors group them by the clue that usually comes first. Your haematologist will know which group, if any, fits your family.
Low platelets from birth
Faults in the RUNX1, ANKRD26 and ETV6 genes often show up first as a low platelet count, or bruising and bleeding, that has been there since childhood. Later in life the risk of MDS or leukaemia rises.
This is often mistaken for an immune platelet problem for years.Normal counts, then leukaemia
Faults in CEBPA and DDX41 usually give no warning in the blood counts. CEBPA faults tend to cause AML in younger people. DDX41 faults often cause MDS or AML later in adult life, more often in men, so the illness looks like ordinary age-related disease.
Infections and immune problems
GATA2 deficiency, a condition where one faulty gene weakens both the marrow and the immune system, often starts with unusual infections or stubborn warts. MDS can follow in teenagers and young adults.
Bone marrow failure syndromes
Conditions such as Fanconi anaemia, where the marrow slowly stops making enough blood cells, and the telomere disorders. They are usually found in childhood and carry a raised risk of MDS and AML.
Often looks like
- Low counts in a child or young adult
- Differences in growth, skin, nails or thumbs
- Unusually strong reactions to chemotherapy
Not sure whether this applies to you?
Ask an oncologistHow it is usually found
How does a doctor work out whether a blood cancer is inherited?
A clue in the story
Another relative with leukaemia or MDS, low platelets that never recovered, a diagnosis at a young age, or unusual infections. Your haematologist asks about both sides of the family.
A clue in the marrow test
The gene panel done on the marrow at diagnosis sometimes finds a fault at a level that suggests it is in every cell, not only in the cancer. That raises the question. It does not answer it.
A test on a sample that is not blood
Blood, and even a cheek swab, can contain leukaemia cells. So the inherited test is often done on a small skin sample grown in the laboratory, or on hair roots or nail clippings. The skin route can take several weeks.
Counselling, then the family
A genetic counsellor explains the result. Relatives can then be tested for that exact fault, starting with brothers and sisters who may be asked to donate stem cells.
On your report
The words you will meet, in plain language
- Germline
- Present in every cell from birth, and so it can be inherited. This is what this page is about.
- Somatic
- A fault found only in the cancer cells. It was not inherited and it cannot be passed on. Marrow panels mostly look for these.
- Predisposition
- A raised chance of developing an illness. It is never a certainty, and many carriers stay well.
- Thrombocytopenia
- A low platelet count. Platelets are the cells that help blood to clot, so a low count can mean easy bruising or bleeding.
- Carrier
- Someone who has the inherited fault. A carrier is not a patient and usually needs regular blood counts rather than treatment.
- Variant of uncertain significance
- A gene change the laboratory cannot yet call harmful or harmless. It should not change your treatment or your donor choice on its own.
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Side by side
What finding an inherited fault changes
An inherited fault is found
No inherited fault is found
A brother or sister carrying it is not used as the stem cell donor
A matched sibling is assessed in the usual way
Some conditions need gentler chemotherapy before a transplant
Treatment is planned on the leukaemia itself
Relatives can be tested for that exact fault
Relatives are advised from the family history
Carriers are offered regular blood counts
No special monitoring is needed for most relatives
Commonly believed
Four things families tell us, and what is actually true
"Leukaemia is in the blood, so the whole family must have it in their blood."
Most leukaemia is acquired. It starts from faults in one person's marrow and is not shared by relatives. Only a small minority of families carry an inherited fault.
"He was diagnosed in his sixties, so it cannot be inherited."
Some inherited faults, DDX41 in particular, usually cause illness later in life. Age alone does not rule it out, which is why many haematologists now ask about testing for older adults too.
"My brother is a perfect match, so he is the ideal donor."
A tissue match and a gene fault are two different questions. A fully matched brother can carry the same fault. That is why related donors are screened when an inherited cause is suspected.
"A normal blood test means I do not carry it."
Many carriers have normal counts for years. Only a gene test for the family's specific fault can say whether you carry it.
Being straight with you
What this page cannot tell you
It cannot tell you whether your family carries a fault. That is worked out by a haematologist and a genetic counsellor who have seen the marrow reports, drawn the family tree and, where needed, arranged a test on the right kind of sample.
It cannot read a report you are holding
A marrow panel and an inherited test answer different questions, and the same gene name can appear on both. What your specific variant means is a question for the counsellor who ordered the test. Tumour and marrow mutation testing is explained on our targeted therapy pages.
Who this does not apply to
Most relatives of someone with leukaemia do not need a genetic test. If one person in the family was diagnosed, with no other blood cancers, no lifelong low platelets and no unusual infections, an inherited cause is unlikely. Studies in Indian families are still small, so some of what is known comes from abroad.
If you are unsure whether your family's story counts, describe it to the helpline. Someone will tell you honestly whether a referral is worth making.Questions we are asked
Common questions about inherited blood cancer risk
Is leukaemia hereditary?
Usually not. Most leukaemia and MDS comes from faults that build up in one person's marrow. A small minority of patients carry an inherited fault that raised their risk from birth. Your haematologist can tell you whether anything in your story points that way.
Why does the test need skin rather than blood?
Because blood from someone with leukaemia contains cancer cells, and their faults can be mistaken for inherited ones. A small skin sample grown in the laboratory gives cells that are free of the cancer. Hair roots or nails are sometimes used instead.
Does this change the treatment itself?
Sometimes. Some inherited conditions make the body more sensitive to chemotherapy or radiation, so doses before a transplant are adjusted. It can also bring a transplant discussion forward. For many people the leukaemia treatment itself stays the same.
Should my children be tested?
It depends on the gene. For conditions that can affect blood counts in childhood, testing children may help. For faults that act late in adult life, testing often waits. Your counsellor will explain which situation applies to your family.
If I carry the fault, will I get leukaemia?
Not necessarily. The risk is raised, but many carriers never develop a blood cancer. Regular blood counts mean a change can be spotted early. How high the risk is depends on the gene and is best discussed with your counsellor.
Can the marrow report tell me if it is inherited?
It can raise a suspicion, but it cannot confirm it. The marrow panel looks at cancer cells. A fault found there may or may not be in the rest of the body. A separate test on a non-blood sample settles the question.
Does this affect marriage or insurance?
India has no dedicated law on genetic discrimination, so it is a fair question to raise before testing. Families often worry about marriage talks too. A counsellor can help you decide who needs to know, and when.
Where do I start?
Write down who in the family had leukaemia, MDS, low platelets or unexplained bleeding, and at roughly what age. Take that list and any marrow reports to your haematologist. Call the CION helpline if you are not sure who to see.
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
- National Cancer Institute — Adult Acute Myeloid Leukemia Treatment (PDQ) - Patient Version
- GeneReviews (NCBI) — RUNX1 Familial Platelet Disorder with Associated Myeloid Malignancies
- GeneReviews (NCBI) — CEBPA-Associated Familial Acute Myeloid Leukemia (AML)
- MedlinePlus Genetics — GATA2 deficiency
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
Clues that a blood cancer may be inheritedThe signs in a family story that should prompt the questionLow platelets running in a familyWhen a lifelong low count is the first clueWhy a related donor must be screenedWhy a matched brother or sister is not automatically safe to useBone marrow failure syndromes and cancer riskFanconi anaemia and related conditions, explained
Talk to us
Wondering whether a blood cancer in your family is inherited?
Tell us who was diagnosed, with what, and at what age. We will tell you honestly whether a genetic referral is worth making and arrange it if it is. One helpline serves every CION centre.