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Learn MorePurpose: Several ALL subtypes have been described depending on their karyotype, cell type, immunophenotype and gene-expression profile. Recently, a novel ALL subtype has been described and is characterized by expression of the pre-B cell receptor (pre-BCR). Interestingly, half of the cases is associated with the chromosomal translocation t(1:19), coding for the chimeric fusion protein E2A-PBX1, which is present in about 5% of pediatric and adult ALL. Using preclinical models, we and other groups have shown very promising preclinical activity of dasatinib in pre-BCR+ ALL and early clinical evidence supports our observations. To study mechanism of acquired dasatinib resistance, we generated dasatinib-resistant pre-BCR+/E2A-PBX1+ cell lines through multiple passages in the presence of increasing drug concentrations. Whole transcriptome analysis of dasatinib-sensitive and resistant ALL cells were performed to detect systematically differentially expressed genes and enriched pathways involved in dasatinib resistance. SOURCE: Jesus Duque-Afonso (jduque@stanford.edu) - Dr. Michael Cleary Stanford University
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