Acute T-lymphoblastic leukemia relapsed with the character of myeloid/natural killer cell precursor phenotype: a case...

Area of Science:

• Hematology
• Oncology
• Immunology

Background:

• Acute lymphoblastic leukemia (ALL) is a heterogeneous lymphoid malignancy.
• Understanding cell surface marker dynamics is crucial for accurate diagnosis and treatment.
• The case presented initial ALL markers including CD7, CD13, CD33, CD34, HLA-DR, and cytoplasmic CD3ε.

Observation:

• The patient was diagnosed with ALL and initially responded to chemotherapy.
• The leukemia relapsed three times, showing significant alterations in cell phenotype.
• Key changes included increased CD56 expression and decreased CD13, CD7, and cytoplasmic CD3ε.

Findings:

• The relapsed leukemia phenotype shifted towards myeloid/natural killer cell precursor acute leukemia (M/NK-AL).
• This phenotypic shift suggests a potential developmental relationship between ALL and M/NK-AL.
• The observed changes indicate a possible evolution from immature T lymphoid precursors.

Implications:

• This case highlights the importance of re-evaluating immunophenotypes in relapsed acute leukemias.
• The findings may refine classifications of acute leukemias with myeloid and lymphoid features.
• Further research into the relationship between ALL, M/NK-AL, and T-lymphoid precursors is warranted.