The duration of SD or objective response (CR+PR) was defined as the time from first occurrence of SD or objective response to the time of PD, or death for any cause. SD was defined as neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for PD, taking as reference the smallest sum diameters while on study. Objective response was defined as having a CR or PR. CR was defined as disappearance of all target and non-target lesions and no new lesions, and all pathological lymph nodes must have decreased to <10 mm in short axis. PR was defined as at least 30% decrease in the sum of diameters of target lesions (taking as reference the baseline sum diameters), no progression in non-target lesions, and no new lesions. PD was defined as at least 20% increase in the sum of diameters of target lesions compared to the smallest sum of diameters on-study and an absolute increase of at least 5 mm, progression of existing non-target lesions, or presence of new lesions.