title: Enumeration and immunohistochemical characterisation of bone marrow basophils in myeloproliferative disorders using the basophil specific monoclonal antibody 2D7.
abstract: BACKGROUND
  Basophils are highly specialised granulocytes that express a unique profile of antigens and increase in myeloproliferative disorders (MPD). In chronic myeloid leukaemia (CML), basophilia is a diagnostic and prognostic determinant. So far, however, no reliable approach for routine detection and enumeration of bone marrow basophils has become available.
  
  
  OBJECTIVE
  To detect and enumerate basophils in bone marrow sections in patients with CML and other MPD.
  
  
  METHODS
  The anti-basophil antibody 2D7 was applied to paraffin embedded bone marrow sections from normal/reactive subjects (n = 31), patients with CML (chronic phase, n = 37; accelerated phase, n = 9), and other MPD (chronic idiopathic myelofibrosis (CIMF), n = 20; polycythaemia vera (PV), n = 20; essential thrombocythaemia (ET), n = 20; indolent systemic mastocytosis (ISM), n = 7).
  
  
  RESULTS
  As assessed by serial section staining, 2D7(+) cells were found to co-express myeloperoxidase, histidine decarboxylase, CD9, and CD43, but did not express B cell or T cell restricted antigens. 2D7(+) bone marrow cells were found to increase in CML compared with normal/reactive bone marrow and other MPD (median numbers of 2D7(+) cells/mm(2): CML, 33; normal/reactive bone marrow, 6; CIMF, 10; PV, 6; ET, 5; ISM, 3; p<0.05). The highest basophil counts were recorded in accelerated phase CML (115/mm(2)).
  
  
  CONCLUSIONS
  A novel immunohistochemical procedure has been established for basophil detection in normal bone marrow and MPD. This approach should help in the quantification of bone marrow basophils at diagnosis and during anti-leukaemic treatment.
authors.affiliation: Department of Internal Medicine I, Division of Haematology and Haemostaseology, Medical University of Vienna, Austria.
authors.forename: H
authors.initials: H
authors.lastname: Agis
authors.forename: M-T
authors.initials: MT
authors.lastname: Krauth
authors.forename: I
authors.initials: I
authors.lastname: Mosberger
authors.forename: L
authors.initials: L
authors.lastname: Müllauer
authors.forename: I
authors.initials: I
authors.lastname: Simonitsch-Klupp
authors.forename: L B
authors.initials: LB
authors.lastname: Schwartz
authors.forename: D
authors.initials: D
authors.lastname: Printz
authors.forename: A
authors.initials: A
authors.lastname: Böhm
authors.forename: G
authors.initials: G
authors.lastname: Fritsch
authors.forename: H-P
authors.initials: HP
authors.lastname: Horny
authors.forename: P
authors.initials: P
authors.lastname: Valent
mesh_terms: D000328:Adult; D000368:Aged; D000911:Antibodies, Monoclonal; D001491:Basophils / Q000737:chemistry / Q000473:pathology*; D015415:Biomarkers / Q000097:blood; D001854:Bone Marrow Cells / Q000276:immunology*; D005260:Female; D006632:Histamine / Q000097:blood; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods; D016130:Immunophenotyping; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000097:blood / Q000276:immunology*; D007958:Leukocyte Count; D008297:Male; D008875:Middle Aged; D009196:Myeloproliferative Disorders / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D015415:Biomarkers; D006632:Histamine