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Artigo em Inglês | MEDLINE | ID: mdl-33629824

RESUMO

BACKGROUND AND AIM: Molecular mechanism of translocation and outcome in variant chronic myeloid leukaemia (vCML) has been a topic of debate. While several cytogenetic studies suggest a low response to Imatinib Mesylate, others demonstrate a similar disease course in both classical and vCML. Besides, many studies comprehensively also link tyrosine kinase domain (TKD) mutations with aggressive clinical outcome. Thus, we aim to study the molecular mechanism of translocation, identify the third partner chromosomes and comment on the disease course and clinical outcome. METHOD: We cytogenetically characterised 25 vCML cases to determine the third partner chromosome, mechanism of translocation and prognostic outcome. We also compared vCML cases with and without TKD mutation to most appropriately outline the clinical consequence and ascertain the potent cause of unresponsiveness to treatment. RESULTS: Third partner chromosome in variant translocation was defined by conventional and molecular cytogenetics. Although in our study most cases showed inadequate clinical response attributable to TKD mutation rather than variant translocation, we observed an inferior outcome in cases involving chromosome 5 as the third partner. CONCLUSION: Thus, we conclude that characterising and reporting new cases of variant translocations, involving various different chromosomes as third partner (with different breakpoints) by cytogenetics, will lead to a better understanding of the disease. To the best of our knowledge, this kind of delineate study has not been applied to precisely comment on the prospects of cytogenetically characterised vCML.

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