2006, Number 4
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Acta Pediatr Mex 2006; 27 (4)
Anaplastic large cell lymphoma ALK+ in children. Morphologic and immunohistochemical analysis
Bornstein-Quevedo L, García-Vázquez FJ, López-Corella E
Language: Spanish
References: 29
Page: 176-182
PDF size: 434.08 Kb.
ABSTRACT
Background. The current classification of anaplastic large cell lymphoma (ALCL) and the correlation of T or B cell lineage with ALK expression are controversial. Although ALCL represents 15% of pediatric lymphomas, the morphologic and immunohistochemical features are not well characterized.
Methods. All large cell lymphomas with anaplastic features accessioned in the surgical pathology files between 1980 and 2002 were studied. Immunophenotyping was performed to identify the ALK+ ALCL.
Results. Fifteen cases were evaluated, seven were ALK-negative (three Hodgkin lymphomas, and four diffuse large B-cell lymphomas). Eight ALK+, CD30+ ALCL with T/null cell immunophenotype were identified in five boys and three girls (median eight years). Immunostaining with CD30 and EMA was observed in 100 and 87% of cases, respectively. Two of the eight ALCL´s had ALK staining restricted to the cytoplasm. Six cases showed T-cell phenotype while only two were considered null-type.
Conclusions. ALK positive ALCL´s are frequent (53%) among large cell lymphomas with anaplastic features. Most of them express CD30, EMA and generic T-cell markers. The use of ALK protein helps to recognize a subgroup of large cell lymphomas.
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