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Ter Brugge, Petra; Moser, Sarah C; Bièche, Ivan; Kristel, Petra; Ibadioune, Sabrina; Eeckhoutte, Alexandre; de Bruijn, Roebi; van der Burg, Eline; Lutz, Catrin; Annunziato, Stefano; de Ruiter, Julian; Masliah Planchon, Julien; Vacher, Sophie; Courtois, Laura; El-Botty, Rania; Dahmani, Ahmed; Montaudon, Elodie; Morisset, Ludivine; Sourd, Laura; Huguet, Léa; Derrien, Heloise; Nemati, Fariba; Chateau-Joubert, Sophie; Larcher, Thibaut; Salomon, Anne; Decaudin, Didier; Reyal, Fabien; Coussy, Florence; Popova, Tatiana; Wesseling, Jelle; Stern, Marc-Henri; Jonkers, Jos; Marangoni, Elisabetta
Nature communications, 04/2023, Letnik: 14, Številka: 1Journal Article
The high frequency of homologous recombination deficiency (HRD) is the main rationale of testing platinum-based chemotherapy in triple-negative breast cancer (TNBC), however, the existing methods to identify HRD are controversial and there is a medical need for predictive biomarkers. We assess the in vivo response to platinum agents in 55 patient-derived xenografts (PDX) of TNBC to identify determinants of response. The HRD status, determined from whole genome sequencing, is highly predictive of platinum response. BRCA1 promoter methylation is not associated with response, in part due to residual BRCA1 gene expression and homologous recombination proficiency in different tumours showing mono-allelic methylation. Finally, in 2 cisplatin sensitive tumours we identify mutations in XRCC3 and ORC1 genes that are functionally validated in vitro. In conclusion, our results demonstrate that the genomic HRD is predictive of platinum response in a large cohort of TNBC PDX and identify alterations in XRCC3 and ORC1 genes driving cisplatin response.
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in: SICRIS
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