Describe the mechanism of action of apalutamide.
Apalutamide is a second-generation antiandrogen that inhibits the binding of androgen to androgen receptor (AR), nuclear translocation of the androgen-AR complex, and binding of AR transcription complex to DNA-binding sites and transcription elements. It does not show antagonist-to-agonist switch like bicalutamide. It is emerging as additional new option to treat castration-resistant prostate cancer.