Clonal selection and double hit events involving tumor suppressor genes underlie relapse from total therapy

Study ID Alternative Stable ID Type
EGAS00001001810 Other

Study Description

In order to gain insights into the mechanisms of disease progression in multiple myeloma (MM) patients treated with multi-agent and high-dose chemotherapy we have performed a longitudinal study of 33 patients entered into Total Therapy protocols using gene expression profiling, high resolution copy number analyses and whole exome sequencing. The results of this study show the importance of acquired mutations in MM driver genes, bi-allelic events affecting tumor suppressor genes and increased proliferation rates in driving relapse, which is enhanced by intra-clonal heterogeneity and Darwinian type clonal evolution. Branching was the most frequent evolution pattern, characterized by clonal loss and appearance of new clones. We found a higher number of lost and acquired copy number aberrations and an excess of bi-allelic inactivation of tumor suppressor genes in GEP70 high risk (HiR) cases, consistent with genomic instability being a key feature of HiR MM. In conclusion, our study further stresses the impact of known prognostic markers and driver genes on the fitness level of MM cells ... (Show More)

Study Datasets 1 dataset.

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Dataset ID Description Technology Samples
Samples were sequenced from 33 multiple myeloma patients including tumor presentation and relapse samples and a matched patient control sample. Tumor DNA was isolated from CD138-positive plasma cells. Control DNA originated from peripheral blood leukapheresis products collected after induction therapy. Libraries were prepared using the SureSelectQXT sample prep kit and the SureSelect Clinical Research Exome kit (Agilent), with additional baits covering the Ig and MYC loci. Paired-end sequencing ... (Show More)
Illumina HiSeq 2500 99

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