Since testosterone is strongly associated with PC tumorigenesis, the main purpose of
endocrine therapy is to silence and eliminate its mechanism of action. Today, several different
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endocrine therapies for advanced or recurred PC have been used, such as GnRH agonist therapy
(inhibits testosterone synthesis from testes due to reduced amount of luteinizing hormone (LH) after
inhibition of GnRH receptor function), antiandrogen therapy (inhibits AR activation by preventing
the binding of testosterone and DHT to AR), and maximum androgen blockage (MAB) (combined
inhibition of testosterone synthesis from testes and AR activation by testosterone and DHT using
both GnRH and anti-androgens). Overall, endocrine therapy is initially highly effective; however
endocrine therapies are never curative due to the resistance development to AR-signaling targeting
agents