Summary
This study will compare the clinical activity of novel regimens (in combination or as
single agents) to SoC in participants with relapsed/refractory advanced NSCLC. The study
will be conducted in two parts. Part 1 is an open-label, optional, non-randomized part
based on safety and pharmacokinetics/pharmacodynamics (PK/PD) evaluation intended to
generate additional data to qualify novel regimens for the randomized study. Part 2 is a
randomized, Phase II open-label part comparing the efficacy and safety of these novel
regimens with SoC. Drug name mentioned as GSK4428859A (belrestotug) and EOS884448 are
interchangeable for the same compound and will be referred to as
GSK4428859A/EOS884448/belrestotug.