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Abstract
The role of BCR/ABL isoforms and their relationships to leukemia phenotype are discussed continuously because of the variety of information reported. Here we describe a man with CML an atypical b3/a3 rearrangement, who had a good response to INF α treatment. This may be due to a deletion of the ABL exon 2 sequences, which are an essential part of the ABL SH3 domain inducing STAT5 expression, which is indeed crucial for the BCR/ABL leukemogenesis; because of its role in anti-apoptotic activity and cell cycle progress.