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Related Experiment Videos

[Large-cell anaplastic lymphomas: a genetic and immunophenotypic study]

B Martínez1, I Gonzalo, M Robledo

  • 1Dpto. de Genética, Fundación Jiménez Díaz, Facultad de Medicina, Universidad Autónoma de Madrid.

Sangre
|August 1, 1995
PubMed
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This study genetically and immunophenotypically characterized anaplastic large-cell lymphomas (ALCL), finding distinct behaviors in CD15+ and CD15- ALCL subtypes. These findings highlight differences that impact therapy and clinical outcomes for Hodgkin

Area of Science:

  • Hematology
  • Oncology
  • Genetics

Background:

  • Anaplastic large-cell lymphoma (ALCL) is a subtype of non-Hodgkin's lymphoma with diverse genetic and immunophenotypic profiles.
  • Distinguishing between ALCL subtypes is crucial for determining appropriate therapeutic strategies and predicting clinical outcomes.
  • Previous studies have suggested potential links between certain ALCL subtypes and Hodgkin's disease (HD).

Purpose of the Study:

  • To genetically characterize non-Hodgkin's anaplastic large-cell lymphomas (ALCL) using Southern blot, PCR, and cytogenetic techniques.
  • To correlate molecular and cytogenetic findings with immunophenotypic data obtained via monoclonal antibody analysis.
  • To investigate the relationship between CD15 expression and the genetic/immunophenotypic characteristics of ALCL.

Main Methods:

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  • Review of 60 ALCL cases, with 19 selected for detailed immunohistologic, genotypic, and cytogenetic analysis.
  • Molecular analysis using Southern blot and PCR with various probes.
  • Cytogenetic analysis employing direct or post-culture GTC banding.
  • Immunophenotyping using a complete panel of monoclonal antibodies with avidin-biotin and APAAP methods.
  • Classification into CD15+ (Hodgkin's-related) and CD15- (classical) groups based on CD15 expression.

Main Results:

  • Only 26.5% of cases demonstrated a complete immunogenetic correlation.
  • The CD15+ group showed a lower rate of gene rearrangement (30%) and fewer cytogenetic abnormalities, similar to Hodgkin's disease.
  • The classical CD15- ALCL group exhibited a higher rate of gene rearrangement (66%).
  • One T-cell case in the classical group displayed an incomplete t(2;5) translocation or polyploid cell lines.

Conclusions:

  • CD15+ ALCL and classical CD15- ALCL exhibit distinct genetic and immunophenotypic profiles.
  • The CD15+ ALCL group, considered Hodgkin's-related, represents a borderline entity requiring recognition due to differing therapeutic approaches and clinical behavior.
  • Immunohistochemistry is effective for assessing B-cell nature and proliferation but has limitations for T-cell specificity in paraffin-embedded samples.