Abstract:
UNLABELLED:Despite the impressive clinical activity of the second-generation antiandrogens enzalutamide and ARN-509 in patients with prostate cancer, acquired resistance invariably emerges. To identify the molecular mechanisms underlying acquired resistance, we developed and characterized cell lines resistant to ARN-509 and enzalutamide. In a subset of cell lines, ARN-509 and enzalutamide exhibit agonist activity due to a missense mutation (F876L) in the ligand-binding domain of the androgen receptor (AR). AR F876L is sufficient to confer resistance to ARN-509 and enzalutamide in in vitro and in vivo models of castration-resistant prostate cancer (CRPC). Importantly, the AR F876L mutant is detected in plasma DNA from ARN-509-treated patients with progressive CRPC. Thus, selective outgrowth of AR F876L is a clinically relevant mechanism of second-generation antiandrogen resistance that can potentially be targeted with next-generation antiandrogens. SIGNIFICANCE:A missense mutation in the ligand-binding domain of the androgen receptor F876L confers resistance to the second-generation antiandrogens enzalutamide and ARN-509 in preclinical models of AR function and prostate cancer and is detected in plasma DNA from ARN-509-treated patients with progressive disease. These results chart a new path for the discovery and development of next-generation antiandrogens that could be coupled with a blood-based companion diagnostic to guide treatment decisions.
journal_name
Cancer Discovjournal_title
Cancer discoveryauthors
Joseph JD,Lu N,Qian J,Sensintaffar J,Shao G,Brigham D,Moon M,Maneval EC,Chen I,Darimont B,Hager JHdoi
10.1158/2159-8290.CD-13-0226subject
Has Abstractpub_date
2013-09-01 00:00:00pages
1020-9issue
9eissn
2159-8274issn
2159-8290pii
2159-8290.CD-13-0226journal_volume
3pub_type
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