PFS was defined as the time at which half of the participants have progressed (progressive disease [PD]) based on RECIST tumor response criteria or died from any cause, whichever occurred first. PD: 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. Participants who had not died or progressed at the time of the final analysis were censored at the date of last contact.

All-treated population: All participants enrolled in the study who had been randomly assigned to one of the four study treatments were included. For analysis, participants receiving both weekly and every 3 weeks of placebo were combined and evaluated as one group.

OS was defined as the median time, in weeks, from the date of randomization to the date of death, due to any cause. Participants who have not died at the time of the final analysis will be censored at the date the participant was last known to be alive. The 90% CI was estimated using Kaplan-Meier methodology.

All-treated population: All participants enrolled in the study who had been randomly assigned to one of the four study treatments were included. For analysis, participants receiving both weekly and every 3 weeks of placebo were combined and evaluated as one group.

Objective response rate (ORR) was defined by RECIST criteria as the best response achieved by a patient over the course of the trial, which includes a complete response (CR) or partial response (PR) that has been confirmed by a second tumor assessment no earlier than 4 weeks after the initial documentation, stable disease (SD), or progressive disease (PD). PR was defined as ≥ 30% decrease in sum of longest diameter of all target lesions, from baseline sum. CR was defined as disappearance of all target and non-target lesions. For CR or PR, tumor measurements must be confirmed by 2nd assessments within 4 weeks. PD = 20% increase in the sum of longest diameter of all target lesions, from smallest sum of longest diameter of all target lesions recorded at or after baseline; or a new lesion; or progression of non-target lesions. SD = Neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for PD, taking as reference the smallest sum diameters while on the study.

All-treated population: All participants enrolled in the study who had been randomly assigned to one of the four study treatments were included. For analysis, participants receiving both weekly and every 3 weeks of placebo were combined and evaluated as one group.

Duration of response was defined as the time from the first documented complete response (CR) or partial response (PR) to the first documented disease progression (PD) or death, whichever occurs first. A CR was defined as the disappearance of all target lesions (TL). A PR was defined as at least a 30% decrease in the sum of the longest diameter (SLD) of TLs taking as reference the Baseline SLD. PD was defined as at least a 20% increase in the SLD of TLs, taking as reference the smallest SLD recorded since treatment started or the unequivocal progression of existing non-TLs.

All-treated population: All participants enrolled in the study who had been randomly assigned to one of the four study treatments were included. For analysis, participants receiving both weekly and every 3 weeks of placebo were combined and evaluated as one group.

This is defined for participants with objective response, as the date of randomization to the date of first CR or PR which will be the date the response is first radiographically documented following initiation of therapy (the date of the actual imaging modality).

All-treated population: All participants enrolled in the study who had been randomly assigned to one of the four study treatments were included. For analysis, participants receiving both weekly and every 3 weeks of placebo were combined and evaluated as one group.