title: Epstein-Barr virus-associated extranodal non-Hodgkin's lymphoma of the sinonasal tract and nasopharynx in Thailand.
abstract: Epstein-Barr virus (EBV) infection is highly associated with specific subtypes of malignant lymphoma. In our previous report on nodal malignant lymphoma in Thailand, we found that 64% of classical Hodgkin's lymphoma (cHL), 51% of non-Hodgkin's lymphoma, T-cell (NHL-T), and 13% of non-Hodgkin's lymphoma, B-cell (NHL-B) were EBV-related. In the present research, we conducted a retrospective study of primary extranodal non-Hodgkin's lymphoma of the sinonasal tract (e-NHL-ST) and primary extranodal non-Hodgkin's lymphoma of the nasopharynx (e-NHL-NP) in Southern Thailand, between 1997 and 2004. EBV-encoded RNA (EBER) expression by in situ hybridization was performed in all cases and a T-cell receptor (TCR)-g gene rearrangement study was performed in NHL-T cases. There were 18 cases of e-NHL-ST and 42 cases of e-NHL-NP detected by histologic and immunohistochemistry examinations. The percentages of e-NHL-ST and e-NHL-NP as compared to nodal malignant lymphoma were 3.7% and 6.8%, respectively. Sixteen cases (88.9%) of e-NHL-ST and 7 cases (16.7%) of e-NHL-NP were NHL-T, and the remainder were NHL-B. All of the NHL-T cases in both sites were EBER-positive. Two (5.4%) of the NHL-B cases in the nasopharynx showed EBER positive. Monoclonal bands of the TCR-gamma gene were detected in 71.4% of the extranodal NK/T-cell lymphomas, nasal type, patients; 50.0% of peripheral T-cell lymphoma, unspecified, patients; and one case of angioimmunoblastic T-cell lymphoma. This study indicates a very strong association of NHL-T in the sinonasal tract or nasopharynx with EBV infection, the link apparently being weaker in NHL-B patients. The study also indicates that most cases of extranodal NK/T-cell lymphoma, nasal type, are not the germline configuration of the TCR genes.
authors.affiliation: Faculty of Medicine, Prince of Songkla University, Hat-Yai, Songkhla 90110, Thailand. miwinyou@medicine.psu.ac.th
authors.forename: Winyou
authors.initials: W
authors.lastname: Mitarnun
authors.forename: Supaporn
authors.initials: S
authors.lastname: Suwiwat
authors.forename: Jintana
authors.initials: J
authors.lastname: Pradutkanchana
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D015331:Cohort Studies; D004279:DNA, Viral / Q000032:analysis; D005260:Female; D004854:Herpesvirus 4, Human / Q000302:isolation & purification*; D006801:Humans; D017403:In Situ Hybridization; D015994:Incidence; D008198:Lymph Nodes / Q000473:pathology; D008228:Lymphoma, Non-Hodgkin / Q000453:epidemiology* / Q000473:pathology / Q000821:virology*; D016399:Lymphoma, T-Cell / Q000453:epidemiology / Q000473:pathology / Q000821:virology; D008297:Male; D008875:Middle Aged; D009303:Nasopharyngeal Neoplasms / Q000453:epidemiology / Q000473:pathology / Q000821:virology*; D010255:Paranasal Sinus Neoplasms / Q000453:epidemiology / Q000473:pathology / Q000821:virology*; D016133:Polymerase Chain Reaction; D011379:Prognosis; D012189:Retrospective Studies; D018570:Risk Assessment; D017678:Sex Distribution; D015996:Survival Rate; D013785:Thailand / Q000453:epidemiology
chemical_list: D004279:DNA, Viral