title: Drug-induced reversible lymphoid dyscrasia: a clonal lymphomatoid dermatitis of memory and activated T cells.
abstract: Certain systemic conditions predispose patients to excessive lymphocyte responses to immune-perturbing drugs, which may progress to malignant lymphoma. Many pathologists and clinicians believe that differentiation of pseudolymphoma from cutaneous T cell lymphoma (CTCL) can be reliably made through phenotypic and molecular analysis. We encountered 15 cases of atypical cutaneous T-cell lymphoid hyperplasia in the setting of drug therapy. We explored phenotypic anomalies using antibodies to CD2, 3, 4, 7, 8, 20, 30 and CD62 K and sought T-cell receptor gene rearrangements by a polymerase chain reaction methodology. The lymphoid infiltrates showed reproducible CD7 and/or CD62 K deletion in concert with T cell clonality and variable CD30 positivity-findings similar to those of CTCL-but the rashes resolved or improved substantially after drug modulation. We hypothesize that the infiltrates represent an unrepressed expansion of CD7- and CD62 K-negative activated memory T lymphocytes in response to antigenic triggers. We propose the term "drug-induced reversible lymphoid dyscrasia" to describe this entity.
authors.affiliation: Department of Pathology, Division of Dermatopathology, Ohio State University, Columbus, USA.
authors.forename: Cynthia M
authors.initials: CM
authors.lastname: Magro
authors.forename: A Neil
authors.initials: AN
authors.lastname: Crowson
authors.forename: Al J
authors.initials: AJ
authors.lastname: Kovatich
authors.forename: Frank
authors.initials: F
authors.lastname: Burns
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015703:Antigens, CD / Q000032:analysis; D001706:Biopsy; D016516:CD4-CD8 Ratio; D002999:Clone Cells / Q000473:pathology; D003872:Dermatitis / Q000209:etiology* / Q000473:pathology; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D016130:Immunophenotyping; D008297:Male; D008875:Middle Aged; D019310:Pseudolymphoma / Q000139:chemically induced* / Q000473:pathology*; D013601:T-Lymphocytes / Q000276:immunology / Q000473:pathology*
chemical_list: D015703:Antigens, CD