American Association for Cancer Research
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Supplementary Data S5 from Optimizing precision medicine for breast cancer brain metastases with functional drug response assessment.

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posted on 2023-06-09, 13:00 authored by Aki Morikawa, Jinju Li, Peter Ulintz, Xu Cheng, Athena Apfel, Dan Robinson, Alex Hopkins, Chandan Kumar-Sinha, Yi-Mi Wu, Habib Serhan, Kait Verbal, Dafydd Thomas, Dan Hayes, Arul M. Chinnaiyan, Veerabhadran Baladandayuthapani, Jason Heth, Matthew B Soellner, Sofia Diana Merajver, Nathan Merrill

GSEA analysis using the oncogenic, KEGG, and GOBP gene sets.

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ARTICLE ABSTRACT

The development of novel therapies for brain metastases is an unmet need. Brain metastases may have unique molecular features that could be explored as therapeutic targets. A better understanding of the drug sensitivity of live cells coupled to molecular analyses will lead to a rational prioritization of therapeutic candidates. We evaluated the molecular profiles of twelve breast cancer brain metastases (BCBM) and matched primary breast tumors to identify potential therapeutic targets. We established six novel patient-derived xenograft (PDX) from BCBM from patients undergoing clinically indicated surgical resection of BCBM and used the PDXs as a drug screening platform to interrogate potential molecular targets. Many of the alterations were conserved in brain metastases compared to the matched primary. We observed differential expressions in the immune-related and metabolism pathways. The PDXs from BCBM captured the potentially targetable molecular alterations in the source brain metastases tumor. The alterations in the PI3K pathway were the most predictive for drug efficacy in the PDXs. The PDXs were also treated with a panel of over 350 drugs and demonstrated high sensitivity to HDAC and proteasome inhibitors. Our study revealed significant differences between the paired BCBM and primary breast tumors with the pathways involved in metabolisms and immune functions. While molecular-targeted drug therapy based on genomic profiling of tumors is currently evaluated in clinical trials for patients with brain metastases, a functional precision medicine strategy may complement such an approach by expanding potential therapeutic options, even for BCBM without known targetable molecular alterations.