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Am J Clin Pathol. 2007 May;127(5):707-22.

Anaplastic Large Cell Lymphoma.

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  • 1Department of Hematopathology, The University of Texas M.D. Anderson Cancer Center, Houston, TX 77030-4095, USA.


Session 8 of the 2005 Society of Hematopathology/European Association for Haematopathology Workshop was devoted to anaplastic large cell lymphoma (ALCL). Most cases submitted were anaplastic lymphoma kinase (ALK)+ ALCL highlighting unusual clinical settings, histologic variants, and variant translocation partners. Cases submitted as ALK- ALCL emphasized the immunohistochemical overlap with classical Hodgkin lymphoma (eg, CD15+/CD30+). It was also clear that consensus histologic and immunohistochemical criteria for the diagnosis of ALK-ALCL are lacking. Many expressed the opinion that ALK-ALCL is not a distinct entity at the immunophenotypic or genetic level and is better designated as peripheral T-cell lymphoma (PTCL), unspecified. Others suggested that the histologic features of ALK-ALCL are distinctive nevertheless and that this diagnosis has meaning that is lost by designating these neoplasms as PTCL, unspecified. This session also included CD30+ anaplastic lymphomas involving skin in which the differential diagnosis included cutaneous ALCL and systemic ALK-ALCL.

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