title: Leu-22: a preferential marker for T-lymphocytes in paraffin sections. Staining profile in T- and B-cell lymphomas, Hodgkin's disease, other lymphoproliferative disorders, myeloproliferative diseases, and various neoplastic processes.
abstract: Monoclonal antibody Leu-22 represents an effective reagent for detection of neoplastic and nonneoplastic T-cells in paraffin sections of routinely processed tissues (242 specimens evaluated). In nonneoplastic tissues, immunoreactivity was localized mainly to lymphoid cells corresponding to a T-cell distribution. Immunoreactivity in lymphoid neoplasms, however, was preferentially, but not exclusively, limited to T-cell populations. Fifty-four of 60 T-cell neoplasms (90%) of various histologic types were Leu-22 positive. The pattern of immunoreactivity consisted mainly of membrane staining, with focal weak cytoplasmic positivity. Twenty-five of 67 B-cell neoplasms (37%) were also Leu-22 positive, with low-grade lymphomas (well/moderately well-differentiated lymphocytic types) representing most immunoreactive cases. In Hodgkin's disease, although most small lymphoid cells were Leu-22 positive, only rare Reed-Sternberg cells were immunoreactive. In all cases, histiocytes and myeloid cells exhibited variable immunoreactivity. The epitope identified by Leu-22 was detectable in formalin- and B5-fixed tissues but apparently was denatured after fixation in Zenker's-acetic acid solution used for bone marrow biopsies. Evaluation of a wide variety of nonhematopoietic neoplasms (64 total) revealed diffuse cytoplasmic staining in a few cases. However, membrane staining, typically noted for lymphoid cells, was not observed. Leu-22 potentially represents a useful marker for lymphoid cells, preferentially of T-cell origin, with optimal applicability as part of a panel that includes an effective pan-B-cell marker.
authors: Department of Pathology, Cedars-Sinai Medical Center, Los Angeles, California.
authors: J W
authors: JW
authors: Said
authors: P N
authors: PN
authors: Stoll
authors: P
authors: P
authors: Shintaku
authors: J M
authors: JM
authors: Bindl
authors: J R
authors: JR
authors: Butmarc
authors: G S
authors: GS
authors: Pinkus
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology* / Q000378:metabolism; D001402:B-Lymphocytes / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D014408:Biomarkers, Tumor / Q000276:immunology*; D002471:Cell Transformation, Neoplastic / Q000276:immunology / Q000473:pathology; D006689:Hodgkin Disease / Q000378:metabolism / Q000473:pathology; D006801:Humans; D007150:Immunohistochemistry; D008223:Lymphoma / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D008228:Lymphoma, Non-Hodgkin / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D008232:Lymphoproliferative Disorders / Q000378:metabolism / Q000473:pathology; D009196:Myeloproliferative Disorders / Q000378:metabolism / Q000473:pathology; D010232:Paraffin; D013601:T-Lymphocytes / Q000276:immunology* / Q000378:metabolism / Q000473:pathology
chemical_list: D000911:Antibodies, Monoclonal; D014408:Biomarkers, Tumor; D010232:Paraffin