Background <p>Mixed phenotype acute leukemias (MPALs) account for approximately 2–5% of acute leukemias.</p> Purpose <p>We report a case of MPAL with <i>BCR::ABL1</i> demonstrating striking spatial segregation of B- and T-lymphoblasts involving the bone marrow and cervical lymph node, respectively.</p> Methods <p>Morphologic, immunophenotypic, and genetic characterization&#xa0;were performed.</p> Results <p>These studies identified two distinct lineage-specific blast populations. Molecular studies demonstrated shared genetic features, supporting a common clonal origin.</p> Conclusions <p>This case expands the clinicopathologic spectrum of MPALs and raises the possibility of lineage-restricted differentiation occurring in distinct tissue microenvironments.</p>

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Spatially segregated B- and T-lymphoblasts in mixed-phenotype acute leukemia with BCR::ABL1

  • Ingrid S. Tam,
  • José-Mario Capo-Chichi,
  • Adam C. Smith,
  • Guillaume Richard-Carpentier,
  • Daniel Xia

摘要

Background

Mixed phenotype acute leukemias (MPALs) account for approximately 2–5% of acute leukemias.

Purpose

We report a case of MPAL with BCR::ABL1 demonstrating striking spatial segregation of B- and T-lymphoblasts involving the bone marrow and cervical lymph node, respectively.

Methods

Morphologic, immunophenotypic, and genetic characterization were performed.

Results

These studies identified two distinct lineage-specific blast populations. Molecular studies demonstrated shared genetic features, supporting a common clonal origin.

Conclusions

This case expands the clinicopathologic spectrum of MPALs and raises the possibility of lineage-restricted differentiation occurring in distinct tissue microenvironments.