Characterization of acute leukemia with t(4;12)

Area of Science:

• Hematology
• Cytogenetics
• Oncology

Background:

• The t(4;12) chromosomal translocation is a rare genetic abnormality observed in acute leukemias.
• This specific translocation has unique characteristics and clinical implications that warrant further investigation.

Purpose of the Study:

• To characterize the clinical and biological features of acute leukemia associated with the t(4;12) translocation.
• To investigate potential differences in presentation and treatment outcomes between adult and pediatric patients with t(4;12) leukemia.

Main Methods:

• Review of twelve reported cases of acute leukemia with t(4;12).
• Analysis of patient demographics, immunophenotypes, and treatment responses.
• Fluorescence in situ hybridization (FISH) analysis to investigate TEL gene rearrangement.

Main Results:

• The t(4;12) abnormality was found in 0.6% of acute leukemias in the reporting laboratory.
• Eight cases were acute myeloid leukemia (AML), three were acute lymphoblastic leukemia (ALL), and one was acute unclassified leukemia (AUL).
• Adults often presented with AML, sometimes secondary to genotoxic exposure, and showed poor remission rates, while children frequently exhibited a B lymphoid phenotype and responded better to treatment.

Conclusions:

• The t(4;12) translocation is associated with distinct leukemia subtypes, including stem cell or secondary AML in adults and B lymphoid leukemia in children.
• The TEL gene on chromosome 12 may be involved in the pathogenesis of t(4;12) leukemia.
• Treatment strategies and outcomes differ significantly between adult and pediatric patients with this specific chromosomal abnormality.