OS was defined as the time from randomization to the date of death from any cause. OS was censored on the last date a subject was known to be alive. Survival follow-up was to be conducted every 3 months after participants's off-treatment date.

All Randomized Participants, Global Population

PFS (primary definition) was defined as the time from the randomization date to the date of the first documented tumor progression based on BICR assessment (per RECIST 1.1), or death from any cause, whichever occurred first. Participants who died without a reported prior progression were considered to have progressed on the date of their death. Participants who had not progressed or died were censored on the date of their last evaluable tumor assessment. Participants who did not have any on-study tumor assessments and did not die were censored on the randomization date. Participants who started any palliative local therapy or subsequent anticancer therapy without a prior reported progression were censored at the last evaluable tumor assessment prior to initiation of the palliative local therapy or subsequent anti-cancer therapy, whichever procedure occurred first.

All Randomized Participants, Global Population

ORR was defined as the number of randomized participants with a best overall response (BOR) of confirmed CR or PR based on BICR assessments (using RECIST v1.1 criteria), divided by the number of all randomized participants. BOR was recorded between the date of randomization and the date of objectively documented progression per RECIST 1.1 or the date of initiation of palliative local therapy or the date of initiation of subsequent anti-cancer therapy, whichever occurred first. For participants without documented progression or palliative local therapy or subsequent anti-cancer therapy, all available response designations contributed to the BOR determination. For participants who continued treatment beyond progression, the BOR was determined based on response designations recorded up to the time of the initial RECIST 1.1 defined progression.

All Randomized Participants, Global Population

DoR was defined as the time between the date of first confirmed documented response (CR or PR) to the date of the first documented BICR-assessed tumor progression (per RECIST 1.1), or death from any cause, whichever occurred first. Participants who started subsequent therapy (including palliative local therapy) without a prior reported progression were censored at the last evaluable tumor assessments prior to initiation of the subsequent anticancer therapy (including palliative local therapy). Participants who died without a reported prior progression were considered to have progressed on the date of their death. For subjects who neither progressed nor died, DoR was censored on the date of their last evaluable tumor assessment. DoR was evaluated for responders (confirmed CR or PR) only.

All confirmed Responders, Global Population

TTR was defined as the time from randomization to the date of the first confirmed documented response (CR or PR), as assessed by the BICR. TTR was evaluated for responders (confirmed CR or PR) only.

All Confirmed Responders, Global Population

ORR was defined as the proportion of randomized participants with a best overall response (BOR) of confirmed complete or partial response per BICR using RECIST v1.1. BOR was assessed from randomization until documented progression, start of palliative local or subsequent anti-cancer therapy-whichever came first. If none occurred, all response data contributed to BOR. For those treated beyond progression, BOR was based on responses before initial RECIST-defined progression. PD-L1 expression was measured via Dako PD-L1 IHC 28-8 pharmDx test as the percentage of tumor cells with membrane staining among ≥100 evaluable cells. Expression was categorized as ≥1%, <1%, not quantifiable, ≥50%, or 1-49%.

All Randomized Participants, Global Population

PFS (primary definition) was defined as the time from the randomization date to the date of the first documented tumor progression based on BICR assessment (per RECIST 1.1), or death from any cause, whichever occurred first. Participants who died without a reported prior progression were considered to have progressed on the date of their death. Participants who had not progressed or died were censored on the date of their last evaluable tumor assessment. Participants who did not have any on-study tumor assessments and did not die were censored on the randomization date. Participants who started any palliative local therapy or subsequent anticancer therapy without a prior reported progression were censored at the last evaluable tumor assessment prior to initiation of the palliative local therapy or subsequent anti-cancer therapy, whichever procedure occurred first.

All Randomized Participants, Global Population

OS was defined as the time from randomization to the date of death from any cause. OS was censored on the last date a subject was known to be alive. Survival follow-up was to be conducted every 3 months after participants's off-treatment date.

All Randomized Participants, Global Population with PD-L1 measurements

OS was defined as the time from randomization to the date of death from any cause. OS was censored on the last date a subject was known to be alive. Survival follow-up was to be conducted every 3 months after participants's off-treatment date.

All Randomized Participants, Global Population

PFS (primary definition) was defined as the time from the randomization date to the date of the first documented tumor progression based on BICR assessment (per RECIST 1.1), or death from any cause, whichever occurred first. Participants who died without a reported prior progression were considered to have progressed on the date of their death. Participants who had not progressed or died were censored on the date of their last evaluable tumor assessment. Participants who did not have any on-study tumor assessments and did not die were censored on the randomization date. Participants who started any palliative local therapy or subsequent anticancer therapy without a prior reported progression were censored at the last evaluable tumor assessment prior to initiation of the palliative local therapy or subsequent anti-cancer therapy, whichever procedure occurred first.

All Randomized Participants, Global Population with tumor mutational burden measurements

ORR was defined as the number of randomized participants with a best overall response (BOR) of confirmed CR or PR based on BICR assessments (using RECIST v1.1 criteria), divided by the number of all randomized participants. BOR was recorded between the date of randomization and the date of objectively documented progression per RECIST 1.1 or the date of initiation of palliative local therapy or the date of initiation of subsequent anti-cancer therapy, whichever occurred first. For participants without documented progression or palliative local therapy or subsequent anti-cancer therapy, all available response designations contributed to the BOR determination. For participants who continued treatment beyond progression, the BOR was determined based on response designations recorded up to the time of the initial RECIST 1.1 defined progression.

All Randomized Participants, Global Population with tumor mutational burden measurements

OS was defined as the time from randomization to the date of death from any cause. OS was censored on the last date a subject was known to be alive. Survival follow-up was to be conducted every 3 months after participants's off-treatment date.

All Randomized Participants, Global Population with tumor mutational burden measurements