Galeterone (Tokai Pharmaceuticals) is a new prostate cancer drug in development that has an interesting triple mechanism of action in that like abiraterone (Zytiga) it acts as a CYP17 lyase inhibitor, but it also acts as an androgen receptor (AR) inhibitor and is an AR degrading drug that decreases AR levels.

How effective it is compared to AR antagonists on the market such as enzalutamide (Medivation) or second-generation AR antagonists in development such as ARN-509 (Aragon Pharmaceuticals) or ODM-201 (Orion Pharma) is one of the many unanswered questions with this drug.

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