Archived Cytogenetic Cell Pellets Used to Detect a BCR::ABL1 Driver Mutation Eight Years before Disease Presentation

Area of Science:

• Hematology
• Oncology
• Molecular Diagnostics

Background:

• The latency period between the occurrence of driver mutations and clinical manifestation of cancer, such as chronic myeloid leukemia (CML), is not fully understood.
• The BCR::ABL1 fusion gene is a key driver mutation in CML, but its presence years before diagnosis remains challenging to ascertain.

Observation:

• A patient diagnosed with CML had a prior bone marrow biopsy eight years earlier for anemia, which showed a del(20q) abnormality but no BCR::ABL1 fusion.
• Retrospective analysis of archived bone marrow pellets from the previous biopsy revealed the presence of the BCR::ABL1 fusion in 1.8% of cells.

Findings:

• This case demonstrates that archived cytogenetic samples can be used to detect the BCR::ABL1 driver mutation up to eight years before CML diagnosis.
• Carnoy's fixed nuclear pellets are suitable for retrospective detection of driver mutations, offering a valuable resource for understanding leukemogenesis.

Implications:

• Archived bone marrow samples can facilitate retrospective studies to elucidate the early events in hematological malignancies.
• Early detection of driver mutations may enable risk stratification, preventive strategies, and earlier therapeutic interventions for CML and other blood cancers.