PFS was defined as the time from the date of randomization to the date of the first documented progression, as determined by investigator assessment per Response Evaluation Criteria in Solid Tumors version 1.1 (RECIST v1.1), or death due to any cause, whichever occurred first.

Intent-to-Treat (ITT) Analysis Set: all randomized participants. Treatment groups were determined according to the treatment they were assigned at the time of randomization. Median PFS was estimated using the Kaplan-Meier method. The 95% confidence interval for median PFS was calculated using the generalization of Brookmeyer and Crowley method with log-log transformation.

Objective response was defined as having a complete response (CR) or partial response (PR), determined based on investigator assessment per RECIST v1.1, recorded post-baseline before and including the first progressive disease, and before new anticancer therapy. CR: disappearance of all target and non-target lesions and no appearance of any new lesions. Any pathological lymph nodes (whether target or non-target) must have a reduction in the short axis to <10 millimeters (mm). PR: complete disappearance or at least a 30% decrease in the sum of the diameters of target lesions, taking as a reference the baseline sum diameters, no new lesions, and no progression of non-target lesions.

DOR was defined as the time from earliest date of disease response (CR or PR) until the earliest date of disease progression, based on investigator assessment per RECIST v1.1, or death from any cause if occurring sooner than progression.

Disease control was defined as having CR, PR, or stable disease (SD) as best response on or after Day 180, based on investigator assessment per RECIST v1.1. CR: disappearance of all target and non-target lesions and no appearance of any new lesions. Any pathological lymph nodes (whether target or non-target) must have a reduction in the short axis to <10 mm. PR: complete disappearance or at least a 30% decrease in the sum of the diameters of target lesions, taking as a reference the baseline sum diameters, no new lesions, and no progression of non-target lesions. PD: progression of a target or non-target lesion or presence of a new lesion. SD: no change in target lesions to qualify for CR, PR, or PD.

Overall survival was defined as the time from the date of randomization to the date of death due to any cause.

Adverse events (AEs) were defined as any untoward medical occurrence associated with the use of a drug in humans, whether or not it was considered drug related. An AE could therefore be any unfavorable or unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of study treatment. A TEAE was defined as any AE either reported for the first time or the worsening of a pre-existing event after the first dose of study drug and within 90 days of the last administration of study drug.

AEs were defined as any untoward medical occurrence associated with the use of a drug in humans, whether or not it was considered drug related. An AE could therefore be any unfavorable or unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of study treatment. A TEAE was defined as any AE either reported for the first time or the worsening of a pre-existing event after the first dose of study drug and within 90 days of the last administration of study drug.