A Global Phase III Study of Rilvegostomig or Pembrolizumab Plus Chemotherapy for First-Line Treatment of Metastatic Squamous Non-small Cell Lung Cancer (NSCLC)

OS is defined as the time from randomization until the date of death due to any cause.

PFS is defined as the time from randomization until radiological progression per Response Evaluation Criteria in Solid Tumors, Version 1.1 (RECIST 1.1) or death due to any cause (in the absence of progression).

PFS2 is defined as the time from randomization until the earliest of the progression event (following the initial progression event), after the start of the first subsequent therapy, or death from any cause, whichever occurs first. The date of the second progression will be recorded by the investigator in the electronic Case Report Form (eCRF) and defined according to local standard clinical practice.

ORR is defined as the proportion of participants who have a confirmed complete response (CR) or confirmed partial response (PR), by using Response Evaluation Criteria in Solid Tumors, Version 1.1 (RECIST 1.1).

DoR is defined as the time from the date of first documented response until the date of documented progression using Response Evaluation Criteria in Solid Tumors, Version 1.1 (RECIST 1.1) or death due to any cause (in the absence of progression).

Concentration of rilvegostomig in serum.

Presence of antidrug antibodies (ADAs), titer, and neutralizing antibodies for rilvegostomig.

Proportion of participants with maintained or improved physical functioning as measured by Patient-Reported Outcomes Measurement Information System Physical Function - Short Form 8c - 7 day (PROMIS PF-SF 8c - 7 day) at each time point.

Time to deterioration (TTD) in pulmonary symptoms as measured by the Non-Small Cell Lung Cancer Symptom Assessment Questionnaire (NSCLC-SAQ). TTD is defined as time from randomization to the date of first deterioration.

Time to deterioration (TTD) of GHS/QoL as measured by the European Organization for Research and Treatment of Cancer Item Library 172 (EORTC IL172). TTD is defined as time from randomization to the date of first deterioration. Deterioration is defined as a worsening change from baseline that reaches a clinically meaningful change threshold.