The aim of this study is to compare the safety and efficacy of SHR3680 with bicalutamide in the treatment of patients with hormone sensitive prostate cancer.

This is an open, multicenter, randomized phase III trial. This clinical study compares the efficacy and safety of SHR3680 with bicalutamide in the patients with hormone sensitive prostate cancer. Approximately 572 patients who meet the entry criteria will be randomly assigned in a 1:1 ratio to SHR3680 or bicalutamide treatment. Primary endpoints of the study are radiological progress-free survival (rPFS) and overall survival (OS).

Inclusion Criteria:

• Age≧18 year, male;
• ECOG performance scale 0 to 1;
• Histologically or cytological confirmed prostate adenocarcinoma without neuroendocrine differentiation or small cell features ;
• Adequate hepatic, renal, heart, and hematological functions;
• Patients have given voluntary written informed consent before performance of any study-related procedure not part of normal medical care,with the understanding that consent may be withdrawn by the subject at any time without prejudice to future medical care.

Exclusion Criteria:

• Subject has received any prior radiation therapy or surgery for prostate cancer, except 1 course of palliative surgical therapy if it was used at least 4 weeks prior to day 1;
• Previous use or are using a second-generation androgen receptor antagonist (enzalutamide, ARN-509, ODM-201), abiraterone, ketoconazole for prostate cancer, or other agents that will inhibit the production of androgens;
• Have participated in an interventional clinical trial or been treated with the following drugs in the past 4 weeks prior to day 1: 5-alpha reductase inhibitors, estrogen, progestin, and herbal products known to decrease PSA levels ;
• Evidence of brain metastasis or primary tumors;
• Planned to initiate any other anti-tumor therapies during the study;
• Unable to swallow, chronic diarrhea and intestinal obstruction, or the presence of a variety of other factors that affect drug use and absorption; Clinically significant cardiovascular diseases;
• History of seizure or certain conditions that may predispose to seizure;
• Severe concurrent disease and infection that, in the judgment of the investigator, would make the patient inappropriate for enrollment.