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Learn MoreIbrutinib plus venetoclax is a highly effective combination in mantle cell lymphoma. However, strategies to enable the evaluation of therapeutic response are required. Our prospective analyses of patients within the AIM study revealed genomic profiles that clearly dichotomized responders and non-responders. Mutations in ATM were present in most patients who achieved a complete response, while chromosome 9p21.1-p24.3 loss and/or mutations in components of the SWI/SNF chromatin remodeling complex were present in all patients with primary resistance and 2/3 patients with relapsed disease. Circulating tumor DNA analysis revealed that these alterations could be dynamically monitored providing concurrent information on treatment response and tumour evolution. Functional modeling demonstrated that compromise of the SWI/SNF complex facilitated transcriptional upregulation of BCL2L1 (Bcl-xL) providing a selective advantage against ibrutinib plus venetoclax. Together these data highlight important insights into the molecular basis of therapeutic response and provide a paradigm for real-time assessment of innovative targeted therapies. SOURCE: Yih-Chih Chan (yih-chih.chan@petermac.org) - Peter MacCallum Cancer Centre
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