The condition and the treatment

Myelofibrosis is a rare condition affecting bone marrow. Bone marrow is where blood cells are made. In myelofibrosis scar tissue builds up inside the bone marrow and blood cells aren't made properly. To make up for this other parts of the body, such as the spleen, begin to make blood cells. When the spleen makes blood cells, it grows in size and this is called splenomegaly. This can cause discomfort in the tummy and feeling full when eating.

Ruxolitinib works by blocking a gene that is important in the production of blood cells. It is taken as a tablet.

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