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The following are treatment options for chronic myelogenous leukemia (CML) in the blast phase. Your healthcare team will suggest treatments based on your needs and work with you to develop a treatment plan.
In the blast phase, the number of leukemia cells in the bone marrow and the blood rises. The white blood cell (WBC) and platelet counts become very abnormal. Symptoms develop and you may have complications, such as bleeding and infections.
Blast crisis occurs when the accelerated phase changes quickly into the blast phase. Signs and symptoms of blast crisis include fever, tiredness, an enlarged spleen and more than 30% of cells in the blood or bone marrow are blasts.
Most of the time, the leukemia cells change during the blast stage, and the disease acts like acute myelogenous leukemia (AML). When this happens, it is treated in a similar way as AML. Find out more about treatments for AML.
Less often, the leukemia cells change, and the disease acts like acute lymphocytic leukemia (ALL). When this happens, it is treated in a similar way as ALL. Find out more about treatments for ALL.
The goal of treatment during the blast phase is to return the CML to the chronic phase. Your healthcare team will check your blood and bone marrow to closely monitor the response to treatment.
Targeted therapy with a tyrosine kinase inhibitor may be offered during the blast phase of CML. If you are already taking targeted therapy, your doctors may increase the dose or try a different drug. The following targeted therapy drugs are used for CML in the blast phase.
Imatinib (Gleevec) is the standard first-line therapy.
Dasatinib (Sprycel) or nilotinib (Tasigna) may be given as a first-line therapy. They may also be given if someone cannot cope with the side effects of imatinib or if CML is resistant to imatinib.
Bosutinib (Bosulif) may be given if someone cannot cope with the side effects of imatinib, dasatinib or nilotinib. Bosutinib is also used if the CML is resistant to these drugs.
Pontatinib (Iclusig) may be given if the CML is resistant to other targeted therapies or if the leukemia cells have a certain gene mutation.
Chemotherapy may be offered for CML in the blast phase. The drugs used depend on if the leukemia cells look like AML or ALL.
The most common drugs used when the leukemia cells look like AML include:
When the leukemia cells look like ALL, the most common drugs used are those listed above, as well as:
During the blast phase, there is a greater risk that leukemia cells will spread to the brain and spinal cord (called the central nervous system, or CNS). The following chemotherapy drugs may be given directly into the spinal fluid (called intrathecal chemotherapy) to prevent or treat CML in the central nervous system:
An allogeneic stem cell transplant may be offered for CML in the blast phase. This therapy is usually more effective in the earlier phases. The stem cell transplant is more likely to be successful if the CML can be brought back to the chronic phase before the transplant.
External beam radiation therapy may be offered for CML in the blast phase to:
Radiation may be given to the brain when the leukemia transforms to ALL. This therapy is used less often than intrathecal chemotherapy.
Sometimes surgery is used to remove the spleen (called a splenectomy). This is done when an enlarged spleen causes discomfort.
Supportive therapy is important during treatment for every phase of CML. It is used to treat the complications that usually happen with treatments for CML and the disease itself.
Supportive therapies given during the blast phase may include:
You may be asked if you want to join a clinical trial for CML. Find out more about clinical trials.