The main exclusion criteria include but are not limited to the following:

• Diagnosis of small cell lung cancer (SCLC) or, for mixed tumors, presence of small cell elements, or has a neuroendocrine tumor with large cell components or a sarcomatoid carcinoma.
• HIV-infected participants with a history of Kaposi's sarcoma and/or Multicentric Castleman's Disease.
• Received prior neoadjuvant therapy for their current NSCLC diagnosis.
• Received or is a candidate to receive radiotherapy for their current NSCLC diagnosis.
• Received prior therapy with an anti-programmed cell death 1 protein (PD-1), anti-PD-ligand 1 (L1), or anti-PD-L2 agent, or with an agent directed to another stimulatory or coinhibitory T-cell receptor.
• Received prior systemic anticancer therapy including investigational agents within 4 weeks before randomization.
• Received a live or live-attenuated vaccine within 30 days before the first dose of study intervention. Administration of killed vaccines are allowed.
• Has received an investigational agent or has used an investigational device within 4 weeks prior to study intervention administration.
• 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.
• Known additional malignancy that is progressing or has required active treatment within the past 5 years.
• Active autoimmune disease that has required systemic treatment in the past 2 years. Replacement therapy (eg, thyroxine, insulin, or physiologic corticosteroid) is allowed.
• History of (noninfectious) pneumonitis/interstitial lung disease that required steroids or has current pneumonitis/interstitial lung disease.
• Active infection requiring systemic therapy.