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CML explained: a cancer managed like a chronic illness | CION Cancer Clinics
Chronic myeloid leukaemia (CML) is a blood cancer where the marrow makes too many white cells because of one gene change, BCR-ABL. For most people found in the early phase, it is controlled with a daily tablet and regular blood tests rather than hospital stays. This page explains what CML is, how it is confirmed, and what it does and does not mean for you. 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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The short answer
What is CML, in plain words?
Chronic myeloid leukaemia (CML) is a blood cancer in which the bone marrow makes too many white blood cells. For most people found in the early phase, it is controlled with a daily tablet and regular blood tests, and life goes on much as before.
What goes wrong inside the cells
Two chromosomes in a blood-forming cell swap pieces. The swap creates a joined gene called BCR-ABL. That gene works like an accelerator stuck down, telling the marrow to keep making white cells. The shortened chromosome left behind is called the Philadelphia chromosome. You will see both names on your reports.
Why it is called chronic
Chronic here means slow, not mild. Without treatment, CML moves forward over time and can change into a fast-growing leukaemia. With treatment, most people stay in the early phase for many years. This is why doctors talk about managing CML the way you would manage diabetes or blood pressure.
It is not passed on in families
The gene change happens during your own life. You were not born with it, and your children do not inherit it.
CML is a different illness from CLL (chronic lymphocytic leukaemia), even though the names sound alike. Check which one is written on your report.The first few months
How is CML usually found and confirmed?
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A blood test that looks odd
Many people have no symptoms. The first clue is often a routine blood count with a very high white cell count, sometimes found during a check for something else.
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Tiredness, a full tummy or weight loss
Others notice tiredness, sweating at night, losing weight without trying, or a heavy feeling under the left ribs. That feeling comes from a swollen spleen, the organ that filters blood.
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The BCR-ABL test
A blood test looks for the BCR-ABL gene. Finding it confirms CML. The same test is repeated for years afterwards to see how well treatment is working.
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A bone marrow test
A small sample of marrow is usually taken from the back of the hip bone. It shows the phase of the disease and checks the chromosomes more closely.
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Starting a daily tablet
Once the diagnosis and phase are clear, your haematologist explains the tablet chosen for you and how often you will be reviewed.
Not sure whether this applies to you?
Ask an oncologistWhy it can be managed
What makes CML different from most other cancers?
Four things together turn CML into a long-term condition for most people.
A tablet aimed at the cause
The medicines are called TKIs (tyrosine kinase inhibitors). They switch off the signal from the BCR-ABL gene. Imatinib was the first. Dasatinib and nilotinib are among the newer ones.
Your team chooses the medicine and the dose. Do not change or stop it on your own.A number you can follow
The BCR-ABL blood test gives a percentage. Watching it fall, and stay low, tells you and your doctor that treatment is doing its job.
Read more about
- The IS scale on your report
- The targets set for the first year
Home, not hospital
Most treatment happens at home. You swallow a tablet, go to work or college, and come in for blood tests and reviews. Admission is not usually part of the routine.
A backup if one tablet fails
If the first medicine does not work well enough, or the side effects are hard to live with, there are other TKIs to try. For a small group, a stem cell transplant at a specialist centre is discussed.
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When not to wait for your next review
Go to the nearest emergency department, or call 108, if you have a high fever with shivering, bleeding that will not stop, black stools, sudden severe pain under the left ribs, or confusion. Tell them you have CML and which tablet you take. Then let your haematology team know the same day.
On your report
Which words will you see on a CML report?
- Philadelphia chromosome (Ph+)
- The shortened chromosome made by the swap. Ph positive means it was found.
- BCR-ABL1
- The joined gene that drives CML. Its level in blood is the main number you will track.
- Chronic phase
- The early, slow phase. Most people are diagnosed here.
- Blasts
- Very young, immature blood cells. A rising share of blasts suggests the disease is moving to a later phase.
- Splenomegaly
- A spleen that is larger than normal. It often shrinks once treatment starts.
- Molecular response
- How far the BCR-ABL level has fallen on the blood test.
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Commonly believed
What do families often get wrong about CML?
"Leukaemia means months of chemotherapy in hospital."
That is true of some fast-growing leukaemias. It is not how chronic phase CML is usually treated. The main treatment is a tablet taken at home, with regular blood tests.
"He feels fine now, so he can stop the tablets."
Feeling well is the tablet working. Stopping without a plan can let CML come back. A few people do stop under close monitoring, but only when their haematologist decides the results allow it.
"The cheaper generic tablet will not work."
Generic versions of TKIs are widely used in India. What matters is taking a quality product every day as prescribed. Ask your team before switching brands, and keep testing as planned.
"A normal blood count means the CML has gone."
Blood counts usually settle early. The BCR-ABL test looks much deeper, and it is the result that guides treatment decisions over the years.
Being straight with you
What can this page not tell you?
This page cannot tell you how your own CML will behave. The phase at diagnosis, how quickly the BCR-ABL level falls, how well you tolerate the tablet and whether you take it every day all shape the outlook. Only your haematologist can put those together for you.
Who this picture does not fit
The steady, tablet-at-home story mainly describes chronic phase CML. If you were diagnosed in the accelerated phase or in blast crisis, the treatment is more intensive and the plan is different. The same applies if the first tablets have not worked, or if a gene mutation makes some of them less useful.
What CION does, and does not do
CION's haematology team reviews your reports, presents your case at a tumour board and helps you plan monitoring. Specialised tests and transplant are arranged with qualified centres. Ask where each test is done, so your results stay comparable.
Bring every blood report since diagnosis to your first visit, including the ones that look old.Questions we are asked
Common questions about CML
Is CML a serious cancer if it is treated with tablets?
Yes, it is a real cancer and it needs treatment for a long time. The tablets make it controllable for most people in chronic phase, not harmless. Missing doses, skipping tests or stopping on your own can let it move forward. Take it seriously, and expect a largely normal routine.
How long will I need to take the tablet?
Most people take it for many years, often for life. Some people with very deep and lasting responses may later try stopping under close watch. That decision depends on several years of results and is made by your haematologist, never by you alone.
Did something I ate or did cause my CML?
Almost always, no. The gene swap happens by chance in one marrow cell. Very high radiation exposure is a known link, but that is rare. Food, stress, mobile phones and past illnesses are not causes. Nothing you or your family did brought this on.
Can I keep working and living normally?
Most people in chronic phase do. Tiredness, muscle cramps and puffiness around the eyes can happen, especially early, and often ease. Tell your team about side effects instead of quietly skipping tablets. There are usually ways to help.
Can CML be caught from someone or passed to my children?
No. CML is not infectious, so you can eat, live and share space with family as usual. It is not inherited either. Planning a pregnancy while on a TKI does need a conversation with your haematologist first, well before you try.
How often will I need blood tests?
More often in the first year, while the team checks that the BCR-ABL level is falling as expected. Once results are stable and low, tests are spaced further apart. Your haematologist sets the schedule. Try to use the same laboratory each time.
Is a bone marrow transplant needed for CML?
Not for most people. Transplant is considered when CML has moved to an advanced phase, or when several tablets have not worked. It is carried out at specialist transplant centres, and your team can help you understand whether it is worth discussing.
Are CML tablets covered by schemes or insurance?
Often, at least in part. Aarogyasri, CGHS, ECHS, EHS, PM-JAY and cashless insurance may cover consultations, tests and medicines, depending on the rules in force. Scheme rules change, so check your current entitlement. Call the helpline and we will help you work it out.
Your Haematologist
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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
- National Cancer Institute — Chronic Myelogenous Leukemia Treatment (PDQ) - Patient Version
- Cancer Research UK — Chronic myeloid leukaemia (CML)
- American Cancer Society — Chronic Myeloid Leukemia (CML)
- Leukemia & Lymphoma Society — Chronic Myeloid Leukemia
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
CML Phases: Chronic, Accelerated and Blast CrisisWhat the phase on your report meansReading Your BCR-ABL Report and the IS ScaleThe number you will track for yearsCML Treatment Milestones at 3, 6 and 12 MonthsWhat your team hopes to see in year oneLiving on a TKI for Decades: PracticalitiesWork, travel and routine on a daily tabletLeukaemia guideHow CML fits among the other leukaemias
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