KEYVIBE-006: This study is evaluating whether immunotherapy (pembrolizumab/vibostolimab) in combination with chemoradiotherapy followed by further treatment with immunotherapy is more effective than treatment with chemoradiotherapy followed by a different type of immunotherapy (durvalumab), in people with non-small cell lung cancerOpen-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

Exclusion

• Has small cell lung cancer (SCLC) or tumors with the presence of small cell elements. Mixed squamous/nonsquamous tumors are eligible
• Has received prior radiotherapy to the thorax, including radiotherapy to the esophagus, mediastinum, or for breast cancer
• Has received major surgery (with the exception of replacement of vascular access) within 4 weeks before randomization. If the participant had a major operation, the participant must have recovered adequately from the procedure and/or any complications from the operation before starting study intervention
• Is expected to require any other form of antineoplastic therapy, while on study
• Has received colony-stimulating factors (e.g., Granulocyte Colony-Stimulating Factor [G-CSF], Granulocyte Macrophage Colony-Stimulating Factor [GM-CSF], or recombinant erythropoietin) within 28 days prior to the first dose of study intervention
• Has received a live or live-attenuated vaccine within 30 days before the first dose of study intervention
• Is currently participating in or has participated in a study of an investigational agent or has used an investigational device within 4 weeks before the first dose of study intervention
• Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of study medication
• Has a known additional malignancy that is progressing or has required active treatment within the past 5 years
• Has an active autoimmune disease that has required systemic treatment in past 2 years
• Has a history of (noninfectious) pneumonitis/interstitial lung disease that required steroids or has current pneumonitis/interstitial lung disease
• Has an active infection requiring systemic therapy
• Has a known history of human immunodeficiency virus (HIV) infection
• Has a known history of Hepatitis B (defined as hepatitis B surface antigen [HBsAg] reactive) or known active Hepatitis C virus (defined as HCV ribonucleic acid [RNA] qualitative is detected) infection
• Has had an allogenic tissue/solid organ transplant

Pemetrexed-specific Criteria:

• Is unable to interrupt aspirin or other nonsteroidal anti-inflammatory drugs (NSAIDs), other than an aspirin dose ≤1.3 grams per day, for at least 2 days (5 days for long-acting agents [for example, piroxicam]) before, during, and for at least 2 days after administration of pemetrexed
• Is unable/unwilling to take folic acid, vitamin B12, and dexamethasone