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Next-generation sequencing has substantially improved our understanding of the genomic landscape of multiple myeloma; however, the application of this technology has been confined mostly to research studies. Here, we report on a customized panel to characterize the mutational profile of 79 newly diagnosed patients with multiple myeloma, older than 65 years and who were not transplant candidates, applying the highest read depth to date that has been used for equivalent studies in multiple myeloma. Overall, we identified 53 genes mutated in 85% of patients, including KRAS, NRAS, BRAF, DIS3 and TP53, and found a complex subclonal structure. In addition, the total number of mutations, as well as mutations in TP53 and the Cereblon pathway, were negatively associated with survival. The latter result is particularly noteworthy as patients enrolled in this phase II clinical trial were treated with lenalidomide, which targets this pathway. Our next-generation sequencing strategy not only identified a group of patients with poor outcome, but also provided an extensive genetic profile that should prove useful in the search for new biomarkers and therapeutic targets in multiple myeloma, at an affordable price and with a small amount of sample, which are indispensable features for translating personalized medicine protocols to clinical practice.

Mutational screening of newly diagnosed multiple myeloma patients by deep targeted sequencing