Article
作者: Deneuve, Jacqueline ; Kannouche, Patricia ; Montagnac, Guillaume ; Koudou, Yves ; Nachabeh, Ghada ; Li, Lie ; Bachelot, Thomas ; Pierotti, Livia ; Michiels, Stefan ; Pradat, Yoann ; Mami-Chouaib, Fathia ; Dalenc, Florence ; Ducoulombier, Agnes ; Godefroy, Karine ; Oulhen, Marianne ; Lacroix-Triki, Magali ; Christodoulidis, Stergios ; Sporchia, Andrea ; Sellami, Dalila ; Vakalopoulou, Maria ; Frenel, Jean Sebastien ; D'Hondt, Veronique ; Suto, Fumitaka ; Loirat, Delphine ; Signolle, Nicolas ; Tran, Diep T N ; Benderra, Marc Antoine ; Sternberg, David W ; Alfaro, Alexia ; Deluche, Elise ; Cheikh-Hussin, Rasha ; Vicier, Cecile ; Droin, Nathalie ; Badel, Severine ; Le Bescond, Loic ; Farace, Françoise ; Catelain, Cyril ; Mayeur, Didier ; Guyader, Pierre ; Job, Bastien ; Talbot, Hugues ; Bernard, Elsa ; Mosele, Fernanda ; Pistilli, Barbara ; André, Fabrice ; Corcos, Noemie
Antibody-drug conjugates have shown impressive clinical outcomes, particularly in metastatic breast cancer, but biomarkers to predict response and resistance remain unidentified. Here we report the results of ICARUS-BREAST01, a phase 2 study evaluating efficacy, safety and biomarkers of response and resistance to patritumab deruxtecan (HER3-DXd), in patients with HR+HER2- metastatic breast cancer, who previously progressed on CDK4/6 inhibitors and one line of chemotherapy. From May 2021 to June 2023, 99 patients were enrolled to receive HER3-DXd 5.6 mg kg-1 intravenously every 3 weeks. The study met its primary endpoint, showing an overall response rate of 53.5% (90% confidence interval [44.8-62.1%]). The most frequent adverse events were fatigue (83%), nausea (75%), diarrhea (53%) and alopecia (40%). Exploratory biomarker analysis of baseline tumor samples suggested preliminary associations between overall response rate and both HER3 spatial distribution and absence of estrogen receptor 1 (ESR1) mutations, as well as between progression-free survival and HER3 expression, pending further validation. Analysis of on-treatment tumor samples showed that treatment efficacy seems to be associated with antibody-drug conjugate intratumoral distribution and interferon response. Overall, HER3-DXd showed promising activity and manageable tolerability in patients with HR+HER2- metastatic breast cancer who progressed on CDK4/6 inhibitors. These findings highlight the need for larger trials to define HER3-DXd efficacy relative to other drugs, including antibody-drug conjugates (ClinicalTrials.gov Identifier: NCT04965766 ).