A Study of Apalutamide (ARN-509) in Men With Non-Metastatic Castration-Resistant Prostate Cancer (SPARTAN)

Inclusion Criteria:

• Histologically or cytologically confirmed adenocarcinoma of the prostate without neuroendocrine differentiation or small cell features with high risk for development of metastases, defined as prostate-specific antigen doubling time (PSADT) less than or equal to (<=) 10 months. PSADT is calculated using at least 3 prostate-specific antigen (PSA) values obtained during continuous ADT (androgen deprivation therapy)
• Castration-resistant prostate cancer demonstrated during continuous ADT, defined as 3 PSA rises, at least 1 week apart, with the last PSA greater than (>) 2 nanogram per milliliter (ng/mL)
• Maintain castrate levels of testosterone within 4 weeks prior to randomization and throughout the study
• Patients currently receiving bone loss prevention treatment with bone-sparing agents must be on stable doses for at least 4 weeks prior to randomization
• Patients who received a first generation anti-androgen (for example, bicalutamide, flutamide, nilutamide) must have at least a 4-week washout prior to randomization AND must show continuing disease (PSA) progression (an increase in PSA) after washout
• At least 4 weeks must have elapsed from the use of 5-alpha reductase inhibitors, estrogens, and any other anti-cancer therapy prior to randomization
• At least 4 weeks must have elapsed from major surgery or radiation therapy prior to randomization
• Eastern Cooperative Oncology Group Performance Status 0 or 1
• Resolution of all acute toxic effects of prior therapy or surgical procedure to Grade <= 1 or baseline prior to randomization
• Adequate organ function according to protocol-defined criteria
• Administration of growth factors or blood transfusions will not be allowed within 4 weeks of the hematology labs required to confirm eligibility

Exclusion Criteria:

• Presence of confirmed distant metastases, including central nervous system and vertebral or meningeal involvement
• Symptomatic local or regional disease requiring medical intervention
• Prior treatment with second generation anti-androgens
• Prior treatment with CYP17 inhibitors
• Prior treatment with radiopharmaceutical agents, or any other investigational agent for non-metastatic castration-resistant prostate cancer
• Prior chemotherapy for prostate cancer except if administered in the adjuvant/neoadjuvant setting
• History of seizure or condition that may pre-dispose to seizure
• Concurrent therapy with protocol-defined excluded medications
• History or evidence of any of the following conditions: any prior malignancy (other than adequately treated basal cell or squamous cell skin cancer, superficial bladder cancer, or any other cancer in situ currently in complete remission) within 5 years prior to randomization; severe/unstable angina, myocardial infarction, symptomatic congestive heart failure, arterial or venous thromboembolic events, or clinically significant ventricular arrhythmias within 6 months prior to randomization; uncontrolled hypertension; gastrointestinal disorder affecting absorption; active infection; and, any other condition that, in the opinion of the investigator, would impair the patient's ability to comply with study procedures