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Establishment of Epstein-Barr Virus Growth-transformed Lymphoblastoid Cell Lines

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Published on: November 8, 2011

[CD5-positive B-cell prolymphocytic leukemia].

Tetsuya Inoue¹, Masaaki Yoshida, Kazuyoshi Oowashi

¹Department of Hematology, Social Insurance Shiga Hospital.

[Rinsho Ketsueki] the Japanese Journal of Clinical Hematology

|February 6, 2010

Summary

This study details a rare case of B-cell prolymphocytic leukemia (B-PLL) in a 68-year-old woman. The leukemia cells expressed the CD5 antigen, a T-cell marker, offering insights into B-cell malignancies.

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Area of Science:

Hematology
Immunology
Oncology

Background:

CD5 is a T-cell marker with an unknown biologic function.
CD5 is expressed in mature B-cell malignancies and chronic lymphoproliferative disorders.

Observation:

A 68-year-old woman presented with jaundice and hepatosplenomegaly.
Hematological examination revealed a low platelet count and elevated white blood cell count.
The patient was diagnosed with B-cell prolymphocytic leukemia (B-PLL).

Findings:

The patient's B-PLL cells expressed the CD5 antigen.
Surface marker analysis confirmed CD5, CD19, CD20, and sIgM positivity.
CD23 and cyclin D1 were negative via immunostaining.

Implications:

This case highlights the aberrant expression of CD5 in B-cell malignancies.
Further research into the role of CD5 in B-cell leukemia pathogenesis is warranted.
Understanding CD5 expression may aid in diagnosing and classifying B-cell disorders.