Chromosome 3 abnormalities, specifically 3q26.2 rearrangements, were associated with treatment resistance and poor prognosis in patients with chronic myelogenous leukemia (CML), report Dr. Wei Wang and coauthors of the department of hematopathology at the University of Texas MD Anderson Cancer Center in Houston.
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A study of 2,013 CML patients found that just 6% of those with 3q26.2 abnormalities achieved complete cytogenetic response during the course of tyrosine kinase inhibitor (TKI) treatment. Patients with other chromosome 3 abnormalities had a significantly better response rate of 42% the investigators found.
Additionally, patients with 3q26.2 chromosome rearrangements had significantly worse survival rates than those with abnormalities involving other chromosomes, with 2-year overall survival rates of 22% and 60%, respectively.
The lack of response to TKI treatment “raises the issue of how to manage these patients,” Dr. Wang and associates said in the report.
“TKIs themselves are not sufficient to control the disease with 3q26.2 abnormalities,” they added. “Intensive therapy, stem cell transplantation, or investigational therapy targeted to EVI1 should be considered,” concluded the authors, who declared that they had no competing financial interests.
Read the full article in Blood.