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Open-label Phase 3 Study of MK-7684A (Coformulation of Vibostolimab With Pembrolizumab) in Combination With Concurrent Chemoradiotherapy Followed by MK-7684A Versus Concurrent Chemoradiotherapy Followed by Durvalumab in Participants With Unresectable, Locally Advanced, Stage III NSCLC
Eligible participants will be randomly allocated to either the Experimental Arm or the Active Comparator Arm. In the Experimental Arm, for the first 3 cycles, participants receive pembrolizumab/vibostolimab (coformulation of 200 mg pembrolizumab and 200 mg vibostolimab) intravenously (IV) on Day 1 plus 3 cycles of investigator's choice of platinum doublet chemotherapy and concurrent standard thoracic radiotherapy (60 Gray [Gy] in 2 Gy fractions for 30 days total) during Cycles 2, 3. Participants then receive pembrolizumab/vibostolimab for Cycles 4-20 or until discontinuation (up to ~14 months). Cycles 1-20 are 21-day cycles. In the Active Comparator Arm, for the first 3 cycles, participants will receive investigator's choice of platinum doublet chemotherapy and concurrent standard thoracic radiotherapy (60 Gy in 2 Gy fractions for 30 days total) during Cycles 2 and 3. Following cCRT, participants receive durvalumab 10 mg/kg every 2 weeks for up to an additional 26 cycles or until discontinuation (up to approximately 14 months). cCRT Cycles 1-3=21-day cycles; durvalumab Cycles 1-26=14-day cycles. Investigator's choice of chemotherapy: cisplatin 75 mg/m^2 and pemetrexed 500 mg/m^2 on Day 1 of Cycles 1-3 for non-squamous histology only; cisplatin 50 mg/m^2 on Days 1, 8 of Cycles 1-2 and Days 8, 15 of Cycle 3 and etoposide 50 mg/m^2 on Days 1-5 of Cycles 1-2 and Days 8-12 of Cycle 3; carboplatin area under the curve (AUC) 6 mg/ml/min on Day 1 of Cycle 1 and AUC 2 mg/ml/min on Days 1, 8, 15 of Cycles 2-3 and paclitaxel 200 mg/m^2 on Day 1 of Cycle 1 and 45 mg/m^2 on Days 1, 8, 15 of Cycles 2-3.