Mondo Description A clonal hematopoietic stem cell disorder, characterized by proliferation in the bone marrow of one or more of the myeloid (i.e., granulocytic, erythroid, megakaryocytic, and mast cell) lineages. It is primarily a neoplasm of adults. (WHO 2008)

Disease Ontology Description A myeloid neoplasm that is characterized by a group of slow growing blood cancers in which large numbers of abnormal red blood cells, white blood cells, or platelets grow and spread in the bone marrow and the peripheral blood.