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Cancer Discovery
Cancer Discovery
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About the Cover

Cover image

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Matissek, Onozato, Sun, and colleagues used anchored multiplex PCR to find gene rearrangements that might drive tumorigenesis in 173 patients with advanced hormone receptor–positive (HR+) breast cancer. Intergenic fusions were identified in 14% of patients, including ESR1-associated fusions in 8 patients, and AKT3, NOTCH1, PRKCA, and BRAF fusions each in 2 patients. Overexpressing PIK3CA, RAF1, or AKT3 kinase fusions activated mTORC1 signaling and induced oncogenic deregulation of breast epithelial cells in three-dimensional cultures, and RPS6KC1–AKT3 fusion accelerated tumor growth in vivo. These tumors were resistant to estrogen withdrawal, but could be resensitized by CDK4/6 inhibition. Moreover, fusion-positive tumors were linked to shorter overall survival in patients with HR+ breast cancer. Collectively, these findings indicate that intergenic fusions can drive tumorigenesis and drug resistance in HR+ breast cancer, suggesting potential therapeutic targets. For details, please see the article by Matissek, Onozato, Sun, and colleagues on page 336.

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Cancer Discovery: 8 (3)
March 2018
Volume 8, Issue 3
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Cancer Discovery
eISSN: 2159-8290
ISSN: 2159-8274

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