A Platform Study of Novel Immunotherapy Combinations in Participants With Previously Untreated, Advanced/Metastatic Non-Small-Cell Lung Cancer

This study will monitor the safety of novel immunotherapy combinations in participants with Programmed death ligand-1 (PD L-1) high (Tumor cells \[TC\]/ Tumor proportion score \[TPS\] \>= 50%), previously untreated, unresectable, locally advanced or metastatic non-small cell lung cancer (NSCLC). Drug name mentioned as Belrestotug, GSK4428859A, and EOS884448 are all interchangeable for the same compound. In the rest of the document, the drug will be referred to as Belrestotug.

Inclusion Criteria: * Histologically or cytologically confirmed diagnosis of locally advanced unresectable NSCLC not eligible for curative surgery and/or definitive radiotherapy with or without chemotherapy or metastatic NSCLC (squamous or non squamous) * No prior systemic therapy for their locally advanced or metastatic NSCLC * Provides a fresh tumor tissue sample or archival sample collected within 2 years prior to screening * PD-L1-high (TC/TPS \>= 50%) tumor * Measurable disease based on RECIST 1.1, as determined by the investigator * Eastern Cooperative Oncology Group (ECOG) Performance Status score of 0 or 1 * Adequate Baseline organ function * Female participants of childbearing potential must use adequate contraception Exclusion Criteria: * Has NSCLC with a tumor that harbors any of the following molecular alterations: EGFR and /or ALK translocations mutations that are sensitive to available targeted inhibitor therapy, Any other known genomic aberrations or oncogenic driver mutations for which a locally approved targeted therapy is available for first-line treatment of locally advanced or metastatic NSCLC. * Had major surgery within 4 weeks or lung radiation of \>30 Gy therapy within 6 months prior to the first dose of study intervention * Received prior therapy with any immune checkpoint inhibitors * Never smoked, defined as smoking \