Abstract
We report a case of chronic myelomonocytic leukaemia (CMML), which transformed first into acute myeloblastic leukaemia (AML) and then into acute lymphoblastic leukaemia (ALL). In the AML and ALL phases, chromosome analysis showed a classic Philadelphia chromosome (Ph) t(9:22)(q34:q11). Molecular studies showed breakpoint cluster region rearrangement between exons e1 and a2 compatible with a p190(bcr/abl) breakpoint as observed in Ph-positive lymphoblastic acute leukaemia. The minor (m-bcr) rearrangement was also detected during complete remission. This observation supports a multistep pathogenesis of leukaemias, and that the p190(bcr/abl) breakpoint may influence the course of the disease.
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