Acute promyelocytic leukaemia (APL) happens when the promyelocytes (a type of blood cell) don’t fully develop and become cancerous. These cancerous cells collect inside the bone marrow, and there isn’t room for enough normal blood cells to be made. This leads to the symptoms of APL such as bruising and bleeding, infections and weight loss.

APL is a rare form of acute myeloid leukaemia (AML) - around 200 people in the UK find out they have APL every year.

APL can progress (develop) very quickly and people diagnosed with APL will start treatment immediately.

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