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| Other names | 17-(3-Pyridyl)-5α-androst-16-en-3-one |
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| Formula | C24H31NO |
| Molar mass | 349.518 g·mol−1 |
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3-Keto-5α-abiraterone, also known as17-(3-pyridyl)-5α-androst-16-en-3-one, is anactive metabolite ofabiraterone acetate that has been found to possessandrogenic activity and to stimulateprostate cancer progression.[1][2] It is formed as follows: abiraterone acetate toabiraterone byesterases; abiraterone toΔ4-abiraterone by3β-hydroxysteroid dehydrogenase/Δ5-4 isomerase; and Δ4-abiraterone to 3-keto-5α-abiraterone by5α-reductase.[1][2] 3-Keto-5α-abiraterone may counteract the clinical effectiveness of abiraterone acetate, and so inhibition of its formation using the5α-reductase inhibitordutasteride is being investigated as anadjunct to abiraterone acetate in the treatment of prostate cancer.[1][2]