Chromosome 5 abnormalities in acute lymphoblastic leukemia.

Area of Science:

• Hematology
• Cytogenetics
• Oncology

Background:

• Acute lymphoblastic leukemia (ALL) is a heterogeneous hematologic malignancy.
• Chromosome abnormalities play a crucial role in ALL pathogenesis and evolution.
• Chromosome 5 aberrations are observed in a subset of ALL cases.

Observation:

• Two distinct cases of acute lymphoblastic leukemia with chromosome 5 involvement were identified.
• Case 1: A 5-year-old boy with L1-ALL presented with del(5)(q13q33) following prior chemotherapy.
• Case 2: A 66-year-old man with L3-ALL exhibited t(5;7)(q12-13;q36) alongside t(8;14)(q24;q32) and der(1).

Findings:

• The del(5)(q13q33) in the first case was interpreted as secondary to chemotherapy treatment.
• The t(5;7)(q12-13;q36) in the second case, along with other aberrations, was considered an evolutionary chromosome rearrangement.
• The t(8;14)(q24;q32) was identified as the primary cytogenetic event in the second case.

Implications:

• These findings highlight the role of chromosome 5 aberrations as evolutionary events in acute lymphoblastic leukemia.
• Chemotherapy can induce secondary chromosomal changes, contributing to disease evolution.
• Understanding these complex genomic alterations is crucial for refining prognostic models and therapeutic strategies in ALL.