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Leukaemia is a cancer of the blood and bone marrow. Unlike many cancers that form a lump or tumour, leukaemia affects the body's blood-forming system, crowding out healthy blood cells and interfering with the body's ability to fight infections, carry oxygen and stop bleeding. Leukaemia can affect people of all ages, from young children to older adults. Understanding how it develops and the different types can make the diagnosis less confusing and help families navigate treatment.
