kasvaja, millele on omane vere valgeliblede või nende eelastete rohkus, tõrjub kõrvale muude vererakkude tekke, kaasnev on mh. aneemia, trombo­tsütopeenia ning küpsete leukotsüütide puudulikkusest tingitud infektsioonid, a progressive, malignant disease of the blood-forming organs, characterized by distorted proliferation and development of leukocytes and their precursors in the blood and bone marrow, progressive disease of man and other warm-blooded animals characterised by the hyperplastic transformation and greatly increased activity of leucopoietic tissue, leading to abnormal accumulations of leucocytes (frequently of immature or abnormal form) first at the site of leucopoiesis and then (usually) in the blood and elsewhere