A Study of Nivolumab or Placebo in Combination With Docetaxel in Men With Advanced Castration-resistant Prostate Cancer

Primary Outcome Measures

1. Radiographic Progressive Free Survival (rPFS) Assessed by Blinded Independent Central Review (BICR) Per Prostate Cancer Working Group 3 (PCWG3)
   rPFS for randomized participants is the time between randomization and the first date of documented progression or death due to any cause, whichever occurs first. The rPFS was censored at the last radiographic tumor assessment up to the start of subsequent cancer therapy for those without progression or death. It was also censored at the date of last radiographic tumor assessment prior to the missed tumor assessments for participants who had progressive disease (PD) or death immediately after more than one consecutive missed tumor assessments. Radiographic progression is defined as at least a 20% increase in the sum of diameters of target lesions, taking as reference the smallest sum on study (this includes the baseline sum if that is the smallest on study). In addition to the relative increase of 20%, the sum must also demonstrate an absolute increase of at least 5 millimeter (mm). The appearance of one or more new lesions is also considered progression.
2. Overall Survival (OS)
   OS for all randomized participants is the time between randomization and the date of death from any cause. For participants who are alive, their survival time was censored at the last date that they were known to be alive. OS was censored for participants at the date of randomization if they had no follow-up.

Secondary Outcome Measures

1. Objective Response Rate (ORR) Assessed by Blinded Independent Central Review (BICR) Per Prostate Cancer Working Group (PCWG3)
   Objective Response Rate per PCWG3 (ORR-PCWG3) is the percentage of participants who have a confirmed complete or partial best overall response (BOR) per PCWG3 among randomized participants who have measurable disease at baseline. Complete Response (CR) is defined as disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to \< 10 mm. Partial Response (PR) is defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters. Baseline was defined as evaluations or events that occur before the date and time of the first dose of study treatment or evaluations on the same date and time of the first dose of study treatment were also considered as baseline evaluations.
2. Time to Response (TTR) Assessed by Blinded Independent Central Review (BICR) Per Prostate Cancer Working Group (PCWG3)
   Time to Response per PCWG3 (TTR-PCWG3) is the time from randomization to the date of the first documented CR or PR per PCWG3, as determined by BICR. Complete Response (CR) is defined as disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to \< 10 mm. Partial Response (PR) is defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters.
3. Duration of Response Assessed by Blinded Independent Central Review (BICR) Per Prostate Cancer Working Group (PCWG3)
   Duration of Response per PCWG3 (DOR-PCWG3) is time between the date of first response (CR/PR per PCWG3) to the date of first documented radiographic progression per PCWG3,as determined by BICR, or death due to any cause whichever occurs first. Complete Response (CR) is defined as disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to \< 10 mm. Partial Response (PR) is defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters. Radiographic progression was defined as at least a 20% increase in the sum of diameters of target lesions, taking as reference the smallest sum on study (this includes the baseline sum if that is the smallest on study). In addition to the relative increase of 20%, the sum must also demonstrate an absolute increase of at least 5 millimeter (mm). The appearance of one or more new lesions is also considered progression.
4. Prostate-specific Antigen (PSA) Response Rate (PSA-RR)
   PSA Response Rate (PSA-RR) is the percentage of randomized participants with a 50% or greater decrease in PSA from baseline to the lowest post-baseline PSA result. A second consecutive value obtained 3 or more weeks later is required to confirm the PSA response. Baseline was defined as valuations or events that occur before the date and time of the first dose of study treatment or evaluations on the same date and time of the first dose of study treatment were also considered as baseline evaluations.
5. Time to PSA Progression (TTP-PSA)
   Time to PSA Progression (TTP-PSA) is the time between randomization to the date of PSA progression per PCWG3 in randomized participants. PSA Progression: For participants with an initial PSA decline from baseline, the date of PSA progression is the date that an increase of 25% or more and an absolute increase of 2 ng/mL or more from the nadir are documented and confirmed by a second consecutive PSA value at least 3 weeks later. For participants with no PSA decline from baseline, the date of PSA progression is date that an increase of 25% or more and an absolute increase of 2 ng/mL or more from baseline are documented at or beyond Week 13. Baseline was defined as valuations or events that occur before the date and time of the first dose of study treatment or evaluations on the same date and time of the first dose of study treatment were also considered as baseline evaluations. Censored at date of last PSA evaluation on/prior to start of subsequent cancer therapy.
6. Number of Participants With Adverse Events
   An Adverse Event (AE) is defined as any new untoward medical occurrence or worsening of a preexisting medical condition in a clinical investigation participant administered study treatment and that does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (such as an abnormal laboratory finding), symptom, or disease temporally associated with the use of study treatment, whether or not considered related to the study treatment.
7. Number of Participants With Serious Adverse Events
   Serious Adverse Event (SAE) is defined as any untoward medical occurrence that, at any dose results in death or Is life-threatening or requires inpatient hospitalization or causes prolongation of existing hospitalization or results in persistent or significant disability/incapacity or is a congenital anomaly/birth defect.
8. Number of Participants With Adverse Events Leading to Discontinuation
   An Adverse Event (AE) is defined as any new untoward medical occurrence or worsening of a preexisting medical condition in a clinical investigation participant administered study treatment and that does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (such as an abnormal laboratory finding), symptom, or disease temporally associated with the use of study treatment, whether or not considered related to the study treatment.
9. Number of Participants With Endocrine Immune-Mediated Adverse Events
   Immune-mediated adverse events are AEs consistent with an immune-mediated mechanism or immune-mediated component for which non-inflammatory etiologies (eg, infection or tumor progression) have been ruled out. IMAEs can include events with an alternate etiology which were exacerbated by the induction of autoimmunity. An Adverse Event (AE) is defined as any new untoward medical occurrence or worsening of a preexisting medical condition in a clinical investigation participant administered study treatment and that does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (such as an abnormal laboratory finding), symptom, or disease temporally associated with the use of study treatment, whether or not considered related to the study treatment.
10. Number of Participants With Non-Endocrine Immune-Mediated Adverse Events
    Immune-mediated adverse events are AEs consistent with an immune-mediated mechanism or immune-mediated component for which non-inflammatory etiologies (eg, infection or tumor progression) have been ruled out. IMAEs can include events with an alternate etiology which were exacerbated by the induction of autoimmunity. An Adverse Event (AE) is defined as any new untoward medical occurrence or worsening of a preexisting medical condition in a clinical investigation participant administered study treatment and that does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (such as an abnormal laboratory finding), symptom, or disease temporally associated with the use of study treatment, whether or not considered related to the study treatment.
11. Number of Participants With Select Adverse Events
    An Adverse Event (AE) is defined as any new untoward medical occurrence or worsening of a preexisting medical condition in a clinical investigation participant administered study treatment and that does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (such as an abnormal laboratory finding), symptom, or disease temporally associated with the use of study treatment, whether or not considered related to the study treatment.
12. Number of Participants Who Died
13. Number of Participants With Worst Common Terminology Criteria (CTC) Grade Laboratory Test Grade Change From Baseline
    The severity of laboratory test results were graded based upon the participants symptoms according to the Common Terminology Criteria for Adverse Events (CTCAE, Version 5.0); Hematology parameters were evaluated for severity according to the following scale: Grade 0 is defined as absence of an AE or within normal limits; Grade 1 = Mild - transient or mild discomfort; no medical intervention required; Grade 2 = Moderate - mild to moderate limitation in activity; Grade 3 = Severe; Grade 4 = Life threatening. Number of participants with worst grade change results to Grade 3 or Grade 4 laboratory test results is presented. E.g., the row title HEMOGLOBIN Grade 0 to Grade 3, Grade 0 is baseline and Grade 3 is post baseline.
14. Number of Participants With Laboratory Abnormalities in Specific Thyroid Tests
    Blood samples were collected for conducting specific thyroid test. Baseline is defined as evaluations or events that occur before the date and time of the first dose of study treatment. Baseline was defined as evaluations or events that occur before the date and time of the first dose of study treatment or evaluations on the same date and time of the first dose of study treatment were also considered as baseline evaluations.
15. Time to Pain Progression as Assessed by Brief Pain Inventory-Short Form (BPI-SF)
    The BPI-SF is an instrument to assess pain and includes severity and interference scores. BPI-SF is an 11-item self-report questionnaire designed to assess severity and impact of pain on daily function. Participants rate severity of pain at its "worst," "least," and "average" in last 24 hours using an 11-point numerical rating scale with anchors of "no pain" and "pain as bad. The participant's assessment of pain with BPI-SF Item number 3 (pain symptoms at their worst over the last 24 hours) form basis for analysis. Time to pain progression is time between date of randomization and date of first increase in worst pain intensity. Pain progression occurred if an increase in worst pain intensity of \>= 2 points is observed from baseline and maintained over 2 consecutive time periods. Baseline was evaluations or events that occur before date and time of first dose of study treatment or evaluations on same date and time of first dose of study treatment were also considered as baseline.