title: HTLV-I positive adult T-cell leukaemia/lymphoma (ATLL) in Chile.
abstract: We describe the clinical and laboratory features of nine patients born in Chile with HTLV-I-positive adult T-cell leukemia/lymphoma (ATLL). All were adults (median age 51 years) of Caucasian origin without evidence of Indian or foreign extraction and none had been out of the country. The main disease features were organomegaly, cutaneous lesions, hypercalcemia and leukemia with atypical polylobed lymphocytes displaying a CD2+, CD3+, CD4+, CD8-, CD7- T-cell phenotype. Eight patients presented with acute type ATLL and one had a chronic form lasting for 16 months prior to the development of the acute phase. Lymph node histology (three cases) was consistent with a T-cell non-Hodgkin's lymphoma (large and small cells). Antibodies to HTLV-I were detected by ELISA and particle agglutination in the serum from eight of nine patients. DNA analysis showed HTLV-I proviral DNA in all seven cases investigated, including the single serologically negative patient. In five cases, HTLV-I was monoclonally integrated and in one case oligoclonal. In the seventh case viral DNA clonal status was ambiguous. Response to therapy was poor and median survival was 3 months (range 2-20 months). This study provides further evidence that HTLV-I is endemic in Chile, a non-tropical country where the two main diseases associated with HTLV-I, ATLL and TSP, are found.
authors.affiliation: Department of Medicine, Faculty of Medicine, University of Chile, Hospital del Salvador, Santiago de Chile.
authors.forename: M E
authors.initials: ME
authors.lastname: Cabrera
authors.forename: S
authors.initials: S
authors.lastname: Labra
authors.forename: D
authors.initials: D
authors.lastname: Catovsky
authors.forename: A M
authors.initials: AM
authors.lastname: Ford
authors.forename: S M
authors.initials: SM
authors.lastname: Colman
authors.forename: M F
authors.initials: MF
authors.lastname: Greaves
authors.forename: E
authors.initials: E
authors.lastname: Matutes
mesh_terms: D000328:Adult; D000368:Aged; D002677:Chile / Q000453:epidemiology; D004279:DNA, Viral / Q000032:analysis; D005192:Family Health; D005260:Female; D015481:HTLV-I Antibodies / Q000032:analysis; D015368:Human T-lymphotropic virus 1 / Q000235:genetics / Q000302:isolation & purification; D006801:Humans; D016130:Immunophenotyping; D015459:Leukemia-Lymphoma, Adult T-Cell / Q000453:epidemiology* / Q000276:immunology / Q000821:virology; D008297:Male; D008875:Middle Aged; D011533:Proviruses / Q000235:genetics
chemical_list: D004279:DNA, Viral; D015481:HTLV-I Antibodies