The goal of this clinical trial is to learn if Rezvilutamide works to treat high-risk prostate cancer in patients who have recently undergone surgery (radical prostatectomy). It will also learn about the safety of Rezvilutamide. The main questions it aims to answer are: Does Rezvilutamide, when used as an add-on treatment after surgery, lower the risk of the cancer returning (biochemical recurrence) within 3 years? What is the 36-month metastasis-free survival (MFS) rate for patients receiving this treatment? What is the safety profile of Rezvilutamide combined with ADT, specifically regarding the types, grades, and incidence of Treatment-Emergent Adverse Events (TEAEs), Serious Adverse Events (SAEs), Adverse Drug Reactions (ADRs), Adverse Events of Special Interest (AESIs), and rare adverse events? What are the exploratory findings regarding the status of immune cells after using Rezvilutamide? Researchers will evaluate the combination of Rezvilutamide and hormone therapy (ADT) to see if it helps keep patients cancer-free. Participants will: Take Rezvilutamide: 240 mg once daily, taken orally before or after breakfast. Each cycle is 28 days, for up to 24 cycles. Treatment continues unless biochemical recurrence, disease progression, intolerable toxicity occurs, or the participant withdraws consent, as determined by the investigator. Receive Androgen Deprivation Therapy (ADT): Leuprorelin 3.75mg via subcutaneous injection, once every 28 days for a total of 12 cycles.
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3-year Biochemical Recurrence-Free Survival (BCRFS) Rate.
Timeframe: Up to 36 months post-enrollment.