diseases in which the bone marrow produces too many of one of the three types of blood cells: red blood cells , which carry oxygen to all the tissues in the body; white blood cells , which fight infection; and platelets , which makes blood clot.
a group of disorders characterised by the over- production of blood cells by the bone marrow. One or more of the cell lineages may be involved and treatment varies according to the type and severity of the disease. See also essential thrombocythaemia, polycythaemia rubra vera.
A group of diseases characterised by the abnormal excess growth of cells in the bone marrow.