title: Leukaemia and allied disorders. 1. Concepts, definitions and classifications.
mesh_terms: D000208:Acute Disease; D000367:Age Factors; D001854:Bone Marrow Cells; D002471:Cell Transformation, Neoplastic; D002908:Chronic Disease; D003937:Diagnosis, Differential; D006413:Hematopoietic System; D006801:Humans; D007938:Leukemia / Q000145:classification* / Q000175:diagnosis; D009365:Neoplasm Regression, Spontaneous; D012075:Remission, Spontaneous; D009626:Terminology as Topic; D013997:Time Factors; D014944:World Health Organization