T-prolymphocytic leukemia with three distinct immunophenotypic subsets.

Area of Science:

• Hematology
• Oncology
• Immunology

Background:

• T-prolymphocytic leukemia (T-PLL) is a rare, aggressive mature T-cell neoplasm.
• It is characterized by chromosome 14 rearrangements leading to TCL1 oncogene overexpression.
• Neoplastic cells usually exhibit a mature T-cell immunophenotype (CD4+).

Purpose of the Study:

• To describe a rare case of T-PLL with significant intratumoral heterogeneity.
• To highlight the utility of TRBC1 analysis in flow cytometry for T-PLL diagnosis.

Main Methods:

• Multiparametric flow cytometry analysis.
• Utilized TRBC1 staining to delineate T-cell subsets.
• Case report of a T-PLL patient.

Main Results:

• Identified three distinct abnormal T-cell subsets in a single T-PLL case.
• Demonstrated phenotypic heterogeneity not typically observed in T-PLL.
• TRBC1 analysis proved valuable in distinguishing these subsets.

Conclusions:

• T-PLL can exhibit striking intratumoral heterogeneity, challenging the notion of phenotypic uniformity.
• TRBC1 flow cytometry is a useful tool for detailed diagnostic assessment and understanding T-PLL complexity.
• This finding emphasizes the importance of comprehensive immunophenotyping in rare hematologic malignancies.