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When CML progresses to blast crisis | CION Cancer Clinics
CML blast crisis is treated much like acute leukaemia. Most people receive a TKI chosen by mutation testing, combined with chemotherapy matched to the type of blast cells. The aim is to return the disease to chronic phase, and then to consider a stem cell transplant for those fit enough. This page explains the types, the treatment path, emergency warning signs and the questions 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 CML blast crisis treated?
- Why does the type of blast crisis change the treatment?
- What happens from diagnosis of blast crisis onwards?
- Which words on the report explain the blast crisis?
- What do families wrongly believe about blast crisis?
- How do you choose where and how to be treated?
- Common questions about CML blast crisis
The short answer
How is CML blast crisis treated?
Blast crisis is treated much like an acute leukaemia. Most people receive a TKI combined with chemotherapy, and a stem cell transplant is considered for those fit enough once the disease is brought back under control.
What blast crisis means
In blast crisis, also called blast phase, CML stops behaving like a slow illness. Large numbers of immature cells called blasts fill the bone marrow and blood. They crowd out normal cells, which causes infections, bleeding, tiredness and a feeling of being very unwell.
Why the plan changes so much
A daily tablet alone is rarely enough at this stage. The goal is first to clear the blasts and return the CML to a chronic phase. Then the team plans how to keep it there, which for many people means a transplant. This is a hospital-based and intensive path.
What this page cannot tell you
It cannot give an outlook for you. That depends on the type of blast cells, any mutations, your age and fitness, and how the disease responds to the first treatment. Your haematologist can explain your own situation.
Do not change, stop or add medicines on your own at this stage. Every decision is made by the treating team.
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What needs emergency care now
A fever or shivering, bleeding that will not stop, black stools, sudden severe headache, confusion or breathlessness in someone with CML in blast crisis can be life-threatening. Call 108 or go to the nearest emergency department at once and say the person has blast crisis CML. Do not wait to see if it settles.
Not sure whether this applies to you?
Ask an oncologistThe type matters
Why does the type of blast crisis change the treatment?
Tests on the blast cells show which family of blood cell they come from. That decides which chemotherapy is added.
Myeloid blast crisis
The most common type. The blasts look like those in acute myeloid leukaemia (AML). Treatment usually pairs a TKI with chemotherapy similar to AML treatment, which often needs a long hospital stay.
Lymphoid blast crisis
Less common. The blasts look like those in acute lymphoblastic leukaemia (ALL). Treatment pairs a TKI with ALL-type chemotherapy, and includes medicine to protect the brain and spinal fluid.
Blast crisis with a mutation
If a BCR-ABL mutation is found, it affects which TKI can work. Some mutations, such as T315I, rule out several TKIs, so the choice narrows.
Tests that guide this
- Flow cytometry of the blasts
- BCR-ABL mutation testing
Diagnosed in blast crisis
A few people first learn they have CML at this stage. They have not yet been exposed to a TKI, which can sometimes mean a better early response than in blast crisis after years of treatment.
The pathway
What happens from diagnosis of blast crisis onwards?
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Confirming the phase
A bone marrow test counts the blasts and identifies their type. Chromosome and mutation tests look for changes that affect treatment.
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Controlling the blood counts
Transfusions, antibiotics and medicines to protect the kidneys may be needed first. Very high white counts are brought down quickly.
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Intensive treatment
A TKI chosen for the mutation results is combined with chemotherapy. The aim is to clear the blasts and return to a chronic phase.
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Checking the response
Repeat marrow and BCR-ABL tests show whether the blasts have cleared. The plan is adjusted if they have not.
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Transplant assessment
For people fit enough, the team discusses an allogeneic stem cell transplant (cells from a matched donor) and starts searching for a donor early.
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Ongoing care
After transplant, or where a transplant is not possible, a TKI usually continues with close monitoring, and supportive care stays central.
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On your report
Which words on the report explain the blast crisis?
- Blasts
- Immature blood cells that have not developed properly. A high share defines blast crisis.
- Accelerated phase
- A stage between chronic phase and blast crisis. Some newer classifications no longer use it.
- Flow cytometry
- A lab test that shows whether the blasts are myeloid or lymphoid.
- Additional chromosome changes
- Extra genetic changes beyond BCR-ABL. They can signal more aggressive disease.
- HLA typing
- A blood test to find a matched stem cell donor, often starting with brothers and sisters.
- Allogeneic transplant
- Replacing the bone marrow with stem cells from a matched donor.
Commonly believed
What do families wrongly believe about blast crisis?
"Blast crisis means nothing more can be done."
Blast crisis is serious, but it is treated actively. Many people return to a chronic phase with treatment, and some go on to a transplant. Where intensive treatment is not suitable, care focused on comfort and quality of life is also real treatment.
"Just increasing the old tablet will fix it."
At this stage the disease has usually escaped the effect of the earlier TKI. A different TKI with chemotherapy is normally needed. Only the treating haematologist can decide the medicine.
"Only a brother or sister can be a donor."
A matched sibling is often checked first, but unrelated donors from registries and, in some centres, half-matched family donors are also used.
"It happened because we did something wrong."
Blast crisis can happen even when tablets were taken faithfully. Missed tablets raise the risk, but this is rarely the only reason. Blame does not help the patient now.
What to do next
How do you choose where and how to be treated?
Blast crisis needs a centre that can give intensive chemotherapy, manage infections and transfusions around the clock, and link you to a transplant unit. Move quickly, because delays matter at this stage.
Questions to ask the team
Ask whether the blasts are myeloid or lymphoid, what the mutation test showed, which TKI and chemotherapy are planned, and whether a transplant is being considered. Ask who to call at night if a fever starts.
Who intensive treatment does not suit
People who are very frail or have serious heart, lung, liver or kidney problems may not tolerate intensive chemotherapy or a transplant. For them, gentler treatment and good supportive care can still control symptoms and protect quality of life.
How CION can help
CION's haematology team, including Dr. Basudev Pokhrel, reviews the reports, presents the case at a tumour board and coordinates with qualified transplant centres. Bring every marrow, BCR-ABL and mutation report you have.
Questions we are asked
Common questions about CML blast crisis
What causes CML to turn into blast crisis?
Over time the leukaemia cells can gain extra genetic changes that make them grow faster and stop maturing. This is more likely if CML is not controlled, for example when the TKI stops working or tablets are missed. Sometimes it happens despite good treatment, and no clear reason is found.
Can blast crisis go back to chronic phase?
Yes, many people return to a chronic phase with a TKI and chemotherapy. How lasting that is varies. For those fit enough, a transplant is often recommended while the disease is controlled, because the chance of blast crisis coming back without one is significant.
Is a bone marrow transplant always needed?
Not always, but it is often recommended for people who are fit and have a suitable donor. It offers the strongest chance of long-term control after blast crisis. For people who cannot have a transplant, a TKI with or without chemotherapy continues, with close monitoring.
How long will the patient be in hospital?
Intensive chemotherapy usually needs a hospital stay of several weeks, because blood counts drop very low and infections are a risk. Lymphoid-type treatment may be given in phases with day-care visits. The team can give an estimate once the plan is chosen.
Why is a mutation test done?
Some changes in the BCR-ABL gene stop certain TKIs working. The test tells the team which TKIs are likely to work and which to avoid. It is usually done as soon as blast crisis is found, before a new TKI is chosen.
Who can be tested as a donor?
Brothers and sisters are usually tested first. If none match, unrelated registry donors or half-matched family members, such as parents or children, may be considered. The transplant centre arranges the matching tests, so ask early which family members should be tested.
What if the patient is too unwell for intensive treatment?
Gentler treatment, such as a TKI alone or with milder chemotherapy, can still slow the disease. Transfusions, infection treatment and symptom control are important. Palliative care, which focuses on comfort and quality of life, can be given alongside treatment, not only at the end.
Can a person in chronic phase prevent blast crisis?
Taking the TKI steadily and keeping every BCR-ABL test on schedule gives the strongest protection. Regular tests pick up early signs that treatment is losing control, so the team can change the TKI before the disease progresses. Tell your team at once about new tiredness, fevers or weight loss.
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
- American Cancer Society — Treating Chronic Myeloid Leukemia by Phase
- Cancer Research UK — Chronic myeloid leukaemia (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.
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