Chronic myeloid leukaemia (CML) is a form of blood cancer, which affects the white blood cells known as myeloid cells. It is a slowly progressing form of leukaemia. Approximately 750 people are diagnosed with CML each year in the UK.
CML can develop at any age, but it is very rare in children and very uncommon in young adults. The average age at diagnosis is between 60 and 65 years. CML is slightly more common in men than in women.
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