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Hairy cell leukaemia: how it is treated | CION Cancer Clinics
Hairy cell leukaemia is usually treated with a single short course of a chemotherapy medicine called a purine analogue, often with the antibody rituximab added. People without symptoms and with steady counts may be watched first. It is a slow-growing blood cancer, and many people return to ordinary life after treatment. This page explains the tests, the options, the recovery weeks and what to ask. At CION Cancer Clinics, every leukaemia, MDS and MPN case is reviewed by our haematologist and discussed at a tumour board before a plan is agreed.
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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
- How is hairy cell leukaemia usually treated?
- What happens between the first report and treatment?
- Which treatments are used, and who are they for?
- What do the words on the report mean?
- What do families often get wrong about it?
- What can this page not tell you?
- Common questions about hairy cell leukaemia treatment
The short answer
How is hairy cell leukaemia usually treated?
Most people with hairy cell leukaemia are treated with a single course of a chemotherapy medicine called a purine analogue, often with an antibody medicine added. Many people who have no symptoms and near-normal blood counts are not treated at first at all. They are watched closely instead.
What the illness is
Hairy cell leukaemia is a rare, slow-growing blood cancer of B cells, a type of white blood cell. Under the microscope the cells have fine, hair-like threads on their surface, which is where the name comes from. The cells collect in the bone marrow and the spleen. That crowds out the healthy blood cells your body needs.
Why the blood report looks the way it does
Because the marrow is crowded, the report often shows low counts in more than one line at once: low haemoglobin, a low platelet count and a low white cell count, especially low monocytes. The spleen is often enlarged, which can cause a dragging feeling or fullness under the left ribs. Repeated infections are a common reason people first see a doctor.
Why this matters for treatment
It behaves very differently from the fast-growing acute leukaemias. Treatment is usually given in a planned way rather than as an emergency, and many people go back to work and ordinary life afterwards.
The pathway
What happens between the first report and treatment?
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A full blood count and a blood smear
A doctor looks at your blood under the microscope. Hairy cells may be seen directly, although in some people they are scarce in the blood and are easier to find in the marrow.
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Flow cytometry
A machine reads the markers on the surface of the cells. Hairy cells carry a typical pattern of markers, which separates this illness from other slow blood cancers that can look similar.
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Bone marrow biopsy
A small sample of marrow is taken from the back of the hip bone under local anaesthetic. It shows how much of the marrow is taken over and gives a baseline to compare with after treatment.
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The BRAF gene test
Most classic hairy cell leukaemia carries a change in a gene called BRAF. Finding it supports the diagnosis and matters later if the illness comes back.
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The decision to treat or to watch
Your haematologist weighs your counts, your spleen size, infections and how you feel. Treatment usually starts when counts fall or symptoms appear, not simply because the diagnosis is made.
Not sure whether this applies to you?
Ask an oncologistTreatment options
Which treatments are used, and who are they for?
These are the approaches you are likely to hear about. Your team chooses between them, and the order they are used in can differ.
Active monitoring
Regular blood counts and check-ups, with no medicine yet. It suits people with no symptoms and counts that are holding steady.
Not suitable if you are getting repeated infections or your counts are falling.Purine analogue chemotherapy
Cladribine or pentostatin. These are the usual first treatment. Each is given as a short course into a vein or under the skin.
What to expect
- Counts drop further for a few weeks first
- Infection risk is highest in that window
Rituximab added
An antibody medicine that sticks to a marker on the leukaemia cells. It is often added to chemotherapy, or used when the illness comes back, to deepen the response.
Targeted tablets
Medicines that block the faulty BRAF signal, such as vemurafenib. They are mainly used when the illness returns or does not respond to chemotherapy.
Not used first in most people, and not helpful if the BRAF change is absent.Removing the spleen
Once common, now rarely needed. It may still be considered for a very large, painful spleen when medicines have not worked or cannot be given.
!
One thing that cannot wait
In the weeks after chemotherapy your white cell count is very low. A fever, shivering, or suddenly feeling very unwell during that time is an emergency. Go to the nearest emergency department the same day or call 108, and tell them you are having treatment for hairy cell leukaemia. Do not wait to see whether it settles.
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On your report
What do the words on the report mean?
- Hairy cells
- The leukaemia cells, named for the thin threads on their surface seen under the microscope.
- Monocytes low
- A type of white blood cell that is typically very low in this illness. It is one of the clues that points towards it.
- CD11c, CD25, CD103
- Surface markers found by flow cytometry. Together they make a pattern typical of hairy cell leukaemia.
- BRAF V600E
- A gene change present in most classic cases. If it is absent, your team may look again at whether this is a related variant illness.
- Splenomegaly
- An enlarged spleen. It is common here and often shrinks with treatment.
- Complete remission
- Remission means no sign of the leukaemia on the tests used. It is not a promise that it will never return.
Commonly believed
What do families often get wrong about it?
"Leukaemia means months of hospital stay."
That picture comes from acute leukaemia. Hairy cell leukaemia treatment is usually a short course, much of it given as a day-care patient. The careful part is the recovery period afterwards, when infections must be caught early.
"If the doctor is not treating it, it must be hopeless."
The opposite is usually true. Watching without treatment is chosen because the illness is quiet and treatment would add side effects without adding benefit yet. Treatment starts when it is needed.
"Once treated, it is gone and we can stop the follow-up."
Hairy cell leukaemia can come back, sometimes years later. Regular blood counts let your team catch it early, when it responds well to treatment again. Keep the appointments even when you feel well.
Being straight with you
What can this page not tell you?
This page cannot tell you which treatment is right for you, or when to start it. That depends on your counts over time, your spleen, your infections, your kidney function and any other illness you have. Only a haematologist who has seen your reports can weigh those together.
It cannot give you an outlook
Your outlook depends on whether this is classic hairy cell leukaemia or a variant, how deeply it responds to the first treatment, and your general health. Ask your haematologist what those mean for you, rather than relying on figures found online, which describe other groups of people.
What CION does, and what it arranges
CION's haematology team reviews your reports, presents your case at a tumour board and plans treatment with you. Where a specialised test such as flow cytometry or a gene test is needed, the team coordinates it with qualified laboratories. Ask which laboratory ran each test, so results can be compared later.
Never change or stop a medicine, including antibiotics or antiviral tablets given for protection, without asking your treating team.Questions we are asked
Common questions about hairy cell leukaemia treatment
Is hairy cell leukaemia the same as other leukaemias?
No. It is a slow-growing leukaemia of B cells, quite different from acute leukaemia, which needs urgent treatment within days. It is also different from chronic lymphocytic leukaemia, though the two can look alike at first. Flow cytometry and a marrow biopsy separate them, which is why those tests matter.
Will my father lose his hair with this chemotherapy?
Hair loss is uncommon with the purine analogue medicines used for this illness. The side effects that need most attention are low blood counts and infections in the weeks after treatment, and sometimes a fever or rash. Your team will explain what to watch for and who to call before treatment begins.
Does treatment need a long hospital admission?
Usually not. Much of the treatment can be given as a day-care patient, going home the same day. Some people are admitted if they already have an infection or very low counts. Plan for frequent blood tests during the recovery weeks, and for someone to bring you in quickly if a fever starts.
Why does the doctor want to check for infection before starting?
Treatment lowers the counts further for a while, so any hidden infection can flare. Tests for hepatitis B, tuberculosis and other infections are common before starting, particularly in India. If one is found, it is usually treated or covered with protective medicine first, so the leukaemia treatment can go ahead safely.
How will we know if treatment has worked?
The blood counts recover gradually over the following months, and the spleen usually shrinks. A repeat bone marrow biopsy is often done after recovery to see how deep the response is. Your haematologist will tell you when that check is due and what the result means for follow-up.
What happens if hairy cell leukaemia comes back?
It can often be treated again. Depending on how long the first response lasted, the same kind of chemotherapy may be repeated, sometimes with rituximab, or a targeted tablet may be used. The choice depends on your counts, your earlier side effects and the BRAF result.
Should we get vaccines during or after treatment?
Ask your haematologist before any vaccine. Some vaccines, such as the inactivated flu vaccine, are often advised at the right time. Live vaccines are usually avoided while immunity is low. Family members being vaccinated can also help protect you. Your team will give you a timetable.
Is treatment covered by Aarogyasri or insurance?
Leukaemia treatment is often covered by Aarogyasri, PM-JAY, CGHS, ECHS, EHS and cashless insurance, but each scheme sets its own rules for medicines and tests, and those rules change. Share your card details with the helpline and ask the team to check your current cover before treatment starts.
Your Haematologist
Meet CION's haematologist. One specialist for your blood report and your plan.
Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
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Sources
- Cancer Research UK — Hairy cell leukaemia
- National Cancer Institute — Hairy Cell Leukemia Treatment (PDQ) - Patient Version
- American Cancer Society — Hairy Cell Leukemia
- Leukemia & Lymphoma Society — Leukemia
- National Health Mission — National Health Mission
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.
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