title: Subcutaneous panniculitis-like T-cell lymphoma: a clinicopathologic, immunophenotypic, and molecular study of 22 Asian cases according to WHO-EORTC classification.
abstract: Subcutaneous panniculitis-like T-cell lymphoma (SPTL) is defined as a rare cytotoxic alpha/beta T-cell lymphoma characterized by primary involvement of subcutaneous tissue mimicking panniculitis and a predominant CD3+/CD4-/CD8+ phenotype in 2005 World Health Organization-European Organization for Research and Treatment of Cancer (WHO-EORTC) classification for cutaneous lymphomas. We presented a detailed study of SPTL, describing clinicopathologic, immunophenotypic, and molecular features of 22 cases in China. Strict diagnostic criteria according to the WHO-EORTC definition were applied to the diagnosis of all SPTL cases. Besides the common features described before, unusual CD4+/CD8- and CD4-/CD8- T-cell phenotypes were noted in 2 of our cases, respectively. CD30 was negative in all cases and CD56 was focally positive in 2 cases. Mortality in cases with angioinvasion (75%) was significantly higher than that in cases without angioinvasion (14.3%). Epstein-Barr virus (EBV) infection was detected in 1 immunocompetent patient by in situ hybridization. The frequency of rearranged TCRB, TCRG, and TCRD genes detected by BIOMED-2 multiplex polymerase chain reaction tubes was 80%, 67%, and 13%, respectively, with a total clonality detection rate of 100%. Clinical follow-up was available in 18 patients, ranging from 6 to 80 months. Most patients obtained complete or partial remission after therapy including one accompanied with EBV infection; 5 patients died: 3 of disease progression, 1 of severe infection, and 1 of complications caused by diabetes and hypertension. We conclude that SPTL as a cytotoxic lymphoma derived from alpha/beta T cell has a predominant CD4-/CD8+ phenotype, but unusual CD4+/CD8- and CD4-/CD8- phenotypes do exist. Owing to its indolent clinical course and relatively high survival rate, SPTL should be differentiated from cutaneous gamma/delta T-cell lymphoma. EBV is generally absent in SPTL but can rarely be detected especially in Asian population. Angioinvasion is a poor prognostic factor in SPTL.
authors: Department of Pathology, Shanghai Medical College, Fudan University, Shanghai, PR China.
authors: Yun-yi
authors: YY
authors: Kong
authors: Bo
authors: B
authors: Dai
authors: Jin-cheng
authors: JC
authors: Kong
authors: Xiao-yan
authors: XY
authors: Zhou
authors: Hong-fen
authors: HF
authors: Lu
authors: Lei
authors: L
authors: Shen
authors: Xiang
authors: X
authors: Du
authors: Da-ren
authors: DR
authors: Shi
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D015704:CD4 Antigens / Q000032:analysis; D019002:CD56 Antigen / Q000032:analysis; D016827:CD8 Antigens / Q000032:analysis; D002648:Child; D002681:China; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D015329:Gene Rearrangement, T-Lymphocyte; D019672:Genes, T-Cell Receptor; D004854:Herpesvirus 4, Human / Q000302:isolation & purification; D006801:Humans; D007150:Immunohistochemistry; D016130:Immunophenotyping; D017403:In Situ Hybridization; D017730:Ki-1 Antigen / Q000032:analysis; D016410:Lymphoma, T-Cell, Cutaneous / Q000145:classification / Q000235:genetics / Q000276:immunology / Q000473:pathology* / Q000628:therapy / Q000821:virology; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D015434:Panniculitis / Q000235:genetics / Q000276:immunology / Q000473:pathology* / Q000821:virology; D016133:Polymerase Chain Reaction; D012878:Skin Neoplasms / Q000145:classification / Q000235:genetics / Q000276:immunology / Q000473:pathology* / Q000628:therapy / Q000821:virology; D050151:Subcutaneous Fat / Q000276:immunology / Q000473:pathology* / Q000821:virology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology / Q000473:pathology* / Q000821:virology; D016896:Treatment Outcome; D014944:World Health Organization
chemical_list: D015704:CD4 Antigens; D019002:CD56 Antigen; D016827:CD8 Antigens; D017730:Ki-1 Antigen