Frontiers in Oncology (May 2025)

Synchronous childhood T-lymphoblastic lymphoma and B-cell precursor acute lymphoblastic leukemia associated with constitutional MMR deficiency syndrome –a case report

  • Joanna Bulsa,
  • Agata Karolina Pastorczak,
  • Joanna Taha,
  • Wojciech Mlynarski,
  • Łukasz Sędek,
  • Tomasz Szczepanski

DOI
https://doi.org/10.3389/fonc.2025.1580494
Journal volume & issue
Vol. 15

Abstract

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We present a four-year-old girl with synchronous T-cell lymphoblastic lymphoma (T-LBL) and B-cell precursor acute lymphoblastic leukemia (BCP-ALL).Development of two lymphoid malignancies arising from completely different cell lineages was confirmed by molecular tests. The cause of cancerogenesis in this patient was a genetic predisposition resulting from mismatch repair deficiency syndrome (CMMRD). Herein, we present the fatal course of the disorder, challenging treatment decisions and need for special approach to the patients with CMMRD-associated malignant proliferation.

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