There are three main types of MPN:

The type of MPN you have depends on the type of blood cell your body is making too many of.

There are around 520 cases of MPN in the UK per year.

In 2008, the World Health Organization defined MPNs as cancers, but this is a matter of definition and doesn’t have any specific impact on the treatment or prognosis for these conditions. Some doctors describe chronic myeloid leukaemia (CML) as an MPN, but it’s more usual to treat this as a separate condition.

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