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El-Botty, Rania; Vacher, Sophie; Mainguené, Juliette; Briaux, Adrien; Ibadioune, Sabrina; Dahmani, Ahmed; Montaudon, Elodie; Nemati, Fariba; Huguet, Léa; Sourd, Laura; Morriset, Ludivine; Château-Joubert, Sophie; Dubois, Thierry; Maire, Virginie; Lidereau, Rosette; Rapinat, Audrey; Gentien, David; Coussy, Florence; Bièche, Ivan; Marangoni, Elisabetta
Molecular oncology, 10/2023, Volume: 17, Issue: 10Journal Article
Triple negative breast cancers (TNBCs) represent 15-20% of all breast cancers and are associated with higher recurrence and distant metastasis rate. Standard of care for early stage TNBC is anthracyclines combined with cyclophosphamide (AC) followed by taxanes, in the neo-adjuvant or adjuvant setting. This work aimed to identify predictive biomarkers of AC response in patient-derived xenograft (PDX) models of TNBC and to validate them in the clinical setting. By gene and protein expression analysis of 39 PDX with different responses to AC, we found that high expression of HORMAD1 was associated with better response to AC. Both gene and protein expression were associated with promoter hypomethylation. In a cohort of 526 breast cancer patients, HORMAD1 was overexpressed in 71% of TNBC. In a second cohort of 186 TNBC patients treated with AC, HORMAD1 expression was associated with longer metastasis-free survival (MFS). In summary, HORMAD1 overexpression was predictive of an improved response to AC in PDX and is an independent prognostic factor in TNBC patients treated with AC.
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