title: Cutaneous lymphocyte-associated antigen (CLA) expression in a lymphoblastoid mantle cell lymphoma presenting with skin lesions. Comparison with other clinicopathologic presentations of mantle cell lymphoma.
abstract: BACKGROUND
  Cutaneous lymphocyte-associated antigen (CLA) is a lymphocyte homing receptor selectively expressed by T cells of the cutaneous immune system and their malignant counterpart, that is to say, cutaneous T-cell lymphomas. However it is absent in the vast mayority of other T-cell malignancies and B-cell lineage lymphomas irrespective on primary tumor site.
  
  
  METHODS
  Expression of CLA was investigated on six cases of mantle cell lymphoma (MCL) which differed in their histopathological subtype (typical or blastic) and their tendency to infiltrate skin and/or central nervous system (CNS).
  
  
  RESULTS
  CLA immunostaining on neoplastic cells was only observed in a 61-year-old female suffering from a lymphoblastoid MCL which clinically presented with specific skin lesions and further developped CNS disease. In this patient, coexpression of CLA with MCL markers (CD20 and CD5) was confirmed by conventional immunohistochemistry and double immunofluorescence studies.
  
  
  CONCLUSIONS
  To our knowledge, CLA immunoreactivity on B-cell lymphomas has not beeen previously reported. The expression of this skin-related adhesion molecule on malignant MCL cells could explain the clinical behavior of our case which presented and relapsed with cutaneous lesions. However, CLA seems not to be a MCL marker nor a CNS-related adhesion molecule. The authors review the clinical and histopathological characteristics of MCL-specific skin lesions and their diagnostic clues based on cell morphology, immunohistochemistry and molecular investigations.
authors.affiliation: Department of Dermatology, Hospital Clínic i Provincial de Barcelona, Barcelona, Spain. rmarti@clinic.ub.es
authors.forename: R M
authors.initials: RM
authors.lastname: Martí
authors.forename: E
authors.initials: E
authors.lastname: Campo
authors.forename: F
authors.initials: F
authors.lastname: Bosch
authors.forename: J
authors.initials: J
authors.lastname: Palou
authors.forename: T
authors.initials: T
authors.lastname: Estrach
mesh_terms: D000328:Adult; D000368:Aged; D018951:Antigens, CD20 / Q000378:metabolism; D000945:Antigens, Differentiation, T-Lymphocyte; D000951:Antigens, Neoplasm / Q000378:metabolism*; D018956:CD5 Antigens / Q000378:metabolism; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D020522:Lymphoma, Mantle-Cell / Q000378:metabolism* / Q000473:pathology; D008297:Male; D008562:Membrane Glycoproteins / Q000378:metabolism*; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000378:metabolism* / Q000473:pathology; D012878:Skin Neoplasms / Q000378:metabolism* / Q000473:pathology
chemical_list: D018951:Antigens, CD20; D000945:Antigens, Differentiation, T-Lymphocyte; D000951:Antigens, Neoplasm; D018956:CD5 Antigens; C063419:CTAGE1 protein, human; D008562:Membrane Glycoproteins