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In the prostate, this reduces prostate volume, which improves BPH and reduces the risk of prostate cancer. Finasteride reduces prostate volume by 20 to 30% in men with benign prostatic hyperplasia. [77] Inhibition of 5α-reductase also reduces epididymal weight, and decreases motility and normal morphology of spermatozoa in the epididymis. [78]
They have also been explored in the treatment and prevention of prostate cancer. While the 5-ARI finasteride reduces the cancer risk by about a third, it also increases the fraction of aggressive forms of prostate cancer. Overall, there does not seem to be a survival benefit for prostate cancer patients under finasteride. [5]
This is a list of 5α-reductase inhibitors (5α-RIs), drugs which inhibit one or more isoforms of the enzyme 5α-reductase.This enzyme is responsible for the conversion of the androgen hormone testosterone into the more potent dihydrotestosterone (DHT) and is essential for the production of neurosteroids like allopregnanolone, tetrahydrodeoxycorticosterone (THDOC), and 3α-androstanediol from ...
[78] [79] [80] Of the SAAs, CPA is the only one that has been widely used in the treatment of prostate cancer. [28]: 488 As antiandrogens, the SAAs have largely been replaced by the NSAAs and are now rarely used in the treatment of prostate cancer, due to the superior selectivity, efficacy, and tolerability profiles of NSAAs.
In addition to active treatment of prostate cancer, antiandrogens are effective as prophylaxis (preventatives) in reducing the risk of ever developing prostate cancer. [32] Antiandrogens have only limitedly been assessed for this purpose, but the 5α-reductase inhibitors finasteride and dutasteride and the steroidal AR antagonist spironolactone ...
Androgen deprivation therapy (ADT), also called androgen ablation therapy or androgen suppression therapy, is an antihormone therapy whose main use is in treating prostate cancer. Prostate cancer cells usually require androgen hormones, such as testosterone, to grow. ADT reduces the levels of androgen hormones, with drugs or surgery, to prevent ...
Finasteride potently inhibits 5α-R2 at a mean inhibitory concentration IC 50 of 69 nM, but is less effective with 5α-R1 with an IC 50 of 360 nM. [21] Finasteride decreases mean serum level of DHT by 71% after 6 months, [22] and was shown in vitro to inhibit 5α-R3 at a similar potency to 5α-R2 in transfected cell lines. [2]
Prostate cancer is the most diagnosed cancer in men in over half of the world's countries, and the leading cause of cancer death in men in around a quarter of countries. [91] Prostate cancer is rare in those under 40 years old, [92] and most cases occur in those over 60 years, [2] with the average person diagnosed at 67. [93]
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