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ALK+ histiocytosis : a novel type of systemic histiocytic proliferative disorder of early infancy

Identifieur interne : 008F00 ( Main/Exploration ); précédent : 008E99; suivant : 008F01

ALK+ histiocytosis : a novel type of systemic histiocytic proliferative disorder of early infancy

Auteurs : John K. C. Chan [Hong Kong] ; Laurence Lamant [France] ; Elizabeth Algar [Australie] ; Georges Delsol [France] ; William Y. W. Tsang [Hong Kong] ; King C. Lee [Hong Kong] ; Karin Tiedemann [Australie] ; Chung W. Chow [Australie]

Source :

RBID : Pascal:09-0005466

Descripteurs français

English descriptors

Abstract

We report 3 cases of a previously uncharacterized form of histiocytosis presenting in early infancy and showing ALK immunoreactivity. The patients presented with pallor, massive hepatosplenomegaly, anemia, and thrombocytopenia. Liver biopsy showed infiltration of the sinusoids by large histiocytes with markedly folded nuclei, fine chromatin, small nucleoli, and voluminous lightly eosinophilic cytoplasm that sometimes was vacuolated or contained phagocytosed blood cells. One patient developed cutaneous infiltrates that morphologically resembled juvenile xanthogranuloma. The histiocytes were immunoreactive for histiocytic markers (CD68, CD163, lysozyme), S100 protein, ALK (membranous and cytoplasmic pattern), and dendritic cell markers (fascin, factor Xllla), but not CD1a and langerin. One case successfully analyzed by molecular techniques revealed TPM3-ALK fusion. Thus the spectrum of diseases exhibiting ALK translocation should be expanded to include ALK+ histiocytosis. The disease in the 3 patients (2 having been given chemotherapy) resolved slowly over many months.


Affiliations:


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Le document en format XML

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histiocytosis : a novel type of systemic histiocytic proliferative disorder of early infancy</title>
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<div type="abstract" xml:lang="en">We report 3 cases of a previously uncharacterized form of histiocytosis presenting in early infancy and showing ALK immunoreactivity. The patients presented with pallor, massive hepatosplenomegaly, anemia, and thrombocytopenia. Liver biopsy showed infiltration of the sinusoids by large histiocytes with markedly folded nuclei, fine chromatin, small nucleoli, and voluminous lightly eosinophilic cytoplasm that sometimes was vacuolated or contained phagocytosed blood cells. One patient developed cutaneous infiltrates that morphologically resembled juvenile xanthogranuloma. The histiocytes were immunoreactive for histiocytic markers (CD68, CD163, lysozyme), S100 protein, ALK (membranous and cytoplasmic pattern), and dendritic cell markers (fascin, factor Xllla), but not CD1a and langerin. One case successfully analyzed by molecular techniques revealed TPM3-ALK fusion. Thus the spectrum of diseases exhibiting ALK translocation should be expanded to include ALK
<sup>+</sup>
histiocytosis. The disease in the 3 patients (2 having been given chemotherapy) resolved slowly over many months.</div>
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