Enhancing precision medicine for patients with breast cancer brain metastases through functional drug testing

Abstract Patient-derived organoids from breast cancer brain metastases enable real-time drug sensitivity testing integrated with genomic profiling. Drug response varied by subtype and molecular alterations. PI3K inhibitors showed activity regardless of PIK3CA mutation status. Pronounced tumor heterogeneity highlighted the urgent need for effective therapies personalized for each patient. Functional assays and molecular matching can help tailor therapy for patients who need the most effective next treatment quickly and warrant further translational evaluation to address this unmet need. Competing Interest Statement The authors have declared no competing interest. Footnotes Co-Senior Authors Sofia D. Merajver & Aki Morikawa Funder Information Declared Susan G. Komen Breast Cancer Foundation, https://ror.org/02nadbe75, Career Catalyst Award Breast Cancer Research Foundation Copyright The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission.