Overall response rate (ORR) was defined as the percentage of participants who achieve partial response (PR) or better according to the response evaluation criteria in solid tumors (RECIST) version1.1, including with either confirmed best overall response of complete response (CR) or PR during the study. CR is disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to less than (<) 10 millimeters (mm). PR is defined as at least a 30 percent (%) decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters, in absence of new lesions or unequivocal progression of non-target lesions.

Response evaluable set included all participants who were androgen receptor (AR) positive by local test and were confirmed evaluable by independent central radiology review (ICRR) and also, who received at least 1 dose of study drug and had at least 1 postbaseline disease assessment or died due to disease progression before first postbaseline disease assessment. Here, 'N' (number of participants analyzed) included 24 response evaluable participants who were analyzed for this outcome measure.

Clinical benefit rate (CBR) was defined as the percentage of participants who achieved a confirmed best overall response of CR, PR, or stable disease (SD) for at least 24 weeks based on RECIST version 1.1 during the study (and prior to subsequent therapy if any). CR is disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to < 10 mm. PR is defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters, in absence of new lesions or unequivocal progression of non-target lesions. SD defined as neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for progressive disease, taking as reference the smallest sum diameters while on study.

Response evaluable set included all participants who were AR positive by local test and who were confirmed evaluable by an ICRR and also, all participants who received at least 1 dose of study intervention and who had at least 1 postbaseline disease assessment or died due to disease progression before the first postbaseline disease assessment. Here, 'N' (number of participants analyzed) included 24 response evaluable participants who were analyzed for this outcome measure.

DCR was defined as the percentage of participants who achieved a confirmed best overall response of CR, PR, or SD based on RECIST version 1.1 during the study (and prior to subsequent therapy if any). CR is disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to < 10 mm. PR is defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters, in absence of new lesions or unequivocal progression of non-target lesions. SD defined as neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for progressive disease, taking as reference the smallest sum diameters while on study.

Response evaluable set included all participants who were AR positive by local test and who were confirmed evaluable by an ICRR and also, all participants who received at least 1 dose of study intervention and who had at least 1 postbaseline disease assessment or died due to disease progression before the first postbaseline disease assessment. Here, 'N' (number of participants analyzed) included 24 response evaluable participants who were analyzed for this outcome measure.

PFS was defined as the time from the date of the initial dose of study intervention to the date of first documented disease progression as defined in the RECIST version 1.1, or death due to any cause, whichever occurred first. Progressive disease 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 mm. The appearance of one or more new lesions is also considered progression.

Treated analysis set included all participants who received at least 1 dose of study intervention.

Overall survival (OS) was defined as the time from the date of the initial dose of study intervention to the date of the participant's death.

Treated analysis set included all participants who received at least 1 dose of study intervention.

TTR was defined among responders (with a CR or PR) as the time between date of the initial dose of study intervention and the first efficacy evaluation that the participant had met all criteria for CR or PR. CR is disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to <10 mm. PR is defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters, in absence of new lesions or unequivocal progression of non-target lesions.

Population analyzed included response evaluable set amongst who were responders (CR or PR).

DoR calculated among responders from the date of initial documentation of a response (CR or PR) to the date of first documented evidence of progressive disease as defined in RECIST version 1.1 or death, whichever occurred first. CR is disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to <10 mm. PR is defined as at least a 30 % decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters, in absence of new lesions or unequivocal progression of non-target lesions.

Population analyzed included response evaluable set amongst who were responders (CR or PR).

Number of participants with TEAEs were reported. Treatment-emergent adverse events (TEAEs) for the treatment phase included events with an onset date/time on or after the start of study intervention through the day of last dose plus 30 days were considered as treatment-emergent.

Safety analysis set included all participants who received at least 1 dose of study intervention.

Plasma concentration of apalutamide was reported.

Pharmacokinetics analysis set included all participants with at least 1 apalutamide and/or N-desmethyl apalutamide concentration data after the first study intervention administration. Here, 'N' (number of participants analyzed) specifies all participants who were evaluated for this outcome measure (OM). Here, 'n' (number analyzed) specifies the number of participants evaluated at specified timepoints.

Plasma concentration of N-desmethyl Apalutamide was reported.

Pharmacokinetics analysis set included all participants with at least 1 apalutamide and/or N-desmethyl apalutamide concentration data after the first study intervention administration. Here, 'N' (number of participants analyzed) specifies all participants who were evaluated for this OM. Here, 'n' (number analyzed) specifies the number of participants evaluated at specified timepoints.