Journal
JOURNAL OF CUTANEOUS PATHOLOGY
Volume 48, Issue 7, Pages 986-994Publisher
WILEY
DOI: 10.1111/cup.14026
Keywords
cutaneous T‐ cell lymphoma; immunohistochemistry; immunophenotype; immunophenotypic switch; T‐ cell receptor gene rearrangement
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Immunophenotypic switch (IS) is a phenomenon that occurs during lymphoma progression, but its clinical implications in CTCL are not well understood. This study presents the clinical, histopathologic, immunophenotypic, and genetic findings of three cases of CTCL that demonstrated IS post treatment to increase awareness of this phenomenon and its diagnostic challenge.
Primary cutaneous T-cell lymphoma (CTCL) comprises a heterogeneous group of neoplasms with variable clinical behavior. Immunophenotypic switch (IS) is a phenomenon that occurs during lymphoma progression and is defined by an alteration in the immunophenotypic expression of a tumor with retention of its genotypic signature. This has been well-recognized in hematopoietic neoplasms; however, it has been rarely reported in CTCL and its clinical implications are not well understood. We present the clinical, histopathologic, immunophenotypic, and genetic findings of three cases of CTCL that demonstrated IS post treatment with variable outcomes. We add our cases to the small number previously reported to increase awareness of this phenomenon and its diagnostic challenge.
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