Multimarker analysis of T-cell chronic lymphocytic leukemia

Area of Science:

• Hematology
• Immunology
• Oncology

Background:

• Chronic lymphocytic leukemia (CLL) is typically characterized by clonal proliferation of malignant B-lymphocytes.
• Diagnosis and subtyping of leukemia rely on immunophenotypic analysis to identify cell lineage and maturity.

Observation:

• A 68-year-old male with CLL presented with splenomegaly and skin infiltration, lacking lymphadenopathy.
• Peripheral blood analysis revealed a high white blood cell count with 95% lymphocytes, E-rosette positive and EAC-rosette negative.
• Immunophenotypic analysis using specific antisera and enzyme assays indicated a mature T-lymphocyte phenotype.

Findings:

• Multimarker analysis demonstrated that the patient's leukemia cells expressed T-cell surface markers.
• The cells reacted with anti-311 antisera (thymocytes and circulating T cells) but not anti-p23,30 (normal B cells).
• Absence of reactivity with anti-Bk (thymocytes only) and lack of terminal deoxynucleotidyl transferase further supported a mature T-cell origin.

Implications:

• This case suggests a potential T-cell variant of CLL, expanding the known spectrum of lymphoid leukemias.
• Understanding the clonal expansion of mature T-cell subpopulations is crucial for accurate diagnosis and treatment strategies.
• Further functional studies are warranted to elucidate the exact nature and behavior of these T-cell leukemia cells.