Study Comparing Rovalpituzumab Tesirine Versus Topotecan in Subjects With Advanced or Metastatic Small Cell Lung Cancer With High Levels of Delta-like Protein 3 (DLL3) and Who Have First Disease Progression During or Following Front-line Platinum-based Chemotherapy (TAHOE)

OS is defined as the time from the date of randomization to the date of death from any cause. Participants were censored at the last date they were documented alive. After the End of treatment, survival information was collected at approximately 6-week intervals (or as requested by sponsor to support data analysis) continuing until the endpoint of death, the participant became lost to follow-up, AbbVie terminated the study, or until 12 February 2020. Calculated using the Kaplan-Meier product-limit method.

Time frame: From randomization until the end of study; median time on follow-up was 20 and 20.6 months for the topotecan and rovalpituzumab tesirine arms, respectively.

Population: Randomized participants

The EORTC QLQ-C15-PAL is an abbreviated 15-item version of the EORTC core quality of life questionnaire (EORTC QLQ-C30) developed for use in palliative care. The score of 'physical functioning scale' score ranges from 0 (very poor) to 100 (excellent).

Time frame: Baseline, Week 7

Population: Randomized participants with an assessment at baseline and Week 7.

CBR is defined as percentage of participants whose best overall response is CR, PR, or stable disease (SD) according to RECIST version 1.1. Radiographic tumor assessments for response were conducted by CT scanning, and assessed from the date of randomization until disease progression or death, whichever came first. Any participant who did not meet CR, PR, or SD, including those who did not have post-baseline radiological assessments were considered as experiencing no clinical benefit. CR: disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to \<10 mm. PR: at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters. SD: neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for PD, taking as reference the smallest sum diameters while on study.

Time frame: Radiographic tumor assessments were conducted at baseline, every 6 weeks for 30 weeks, then every 9 weeks until progression or death; median time on follow-up was 20 and 20.6 months for the topotecan and rovalpituzumab tesirine arms, respectively.

Population: Randomized participants with measurable disease at baseline.

DOR is defined as the time between the date of first response (CR or PR, whichever is recorded first) to the date of the first documented tumor progression (per RECIST version 1.1) or death due to any cause, whichever comes first. Radiographic tumor assessments for response were conducted by CT scanning, and assessed from the date of randomization until disease progression or death, whichever came first. Any participant who did not meet CR or PR, including those who did not have post-baseline radiological assessments were considered non-responders. CR: Disappearance of all target and non-target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to \< 10 mm. PR: At least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters.

Time frame: Radiographic tumor assessments were conducted at baseline, every 6 weeks for 30 weeks, then every 9 weeks until progression or death; median time on follow-up was 20 and 20.6 months for the topotecan and rovalpituzumab tesirine arms, respectively.

Population: Randomized participants with measurable disease at baseline, and a response.

ORR is defined as the percentage of participants whose best overall response is either complete response (CR) or partial response (PR) according to RECIST version 1.1. Radiographic tumor assessments for response were conducted by CT scanning, and assessed from the date of randomization until disease progression or death, whichever came first. Any participant who did not meet CR or PR, including those who did not have post-baseline radiological assessments were considered non-responders. CR: Disappearance of all target and non-target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to \< 10 mm. PR: At least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters.

Time frame: Radiographic tumor assessments were conducted at baseline, every 6 weeks for 30 weeks, then every 9 weeks until progression or death; median time on follow-up was 20 and 20.6 months for the topotecan and rovalpituzumab tesirine arms, respectively.

Population: Randomized participants with measurable disease at baseline.

PFS is defined as the number of months from the date of randomization until the date of first progression or the date of a participant's death, whichever occurs first. If a participant neither experienced disease progression nor died, then the participant's data were censored at the last date of radiographic assessment that they were documented to be progression free. Calculated using the Kaplan-Meier product-limit method. Radiographic tumor assessments for response were conducted by CT scanning according to Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.1. Progressive Disease (PD) was defined as at least a 20% increase in the size of target lesions and an absolute increase of at least 5 mm taking as reference the smallest lesion size recorded since the treatment started (baseline or after), or the appearance of one or more new lesions.

Time frame: From randomization until the end of study; median time on follow-up was 20 and 20.6 months for the topotecan and rovalpituzumab tesirine arms, respectively.

Population: Randomized participants