PFS is defined as the time from the date of randomization to the date of radiographically documented progressive disease (PD) based on investigator assessment, or the date of death due to any cause, whichever is first assessed via Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1. Progressive Disease (PD) was at least a 20% increase in the sum of the diameters of target lesions, taking as reference the smallest sum 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 1 or more new lesions is also considered progression.