M7824 With cCRT in Unresectable Stage III Non-small Cell Lung Cancer (NSCLC)

Inclusion Criteria

• Participants must have histologically documented NSCLC who present with Stage III locally advanced, unresectable disease (International Association for the Study of Lung Cancer Staging Manual in Thoracic Oncology
• Participants with tumor harboring an Epidermal growth factor receptor (EGFR) sensitizing (activating) mutation, Anaplastic lymphoma kinase (ALK) translocation, ROS-1 rearrangement are eligible.
• Participants must have adequate pulmonary function defined as a forced expiratory volume in 1 second (FEV1) greater than equals to (>=) 1.2 liters or >= 50% of predicted normal volume measured within 3 weeks prior to randomization.
• Adequate hematological, hepatic and renal function as defined in the protocol
• Contraceptive use by males or females will be consistent with local regulations on contraception methods for those participating in clinical studies

Exclusion Criteria

• Participants with Mixed small cell with non-small cell lung cancer histology
• Recent major surgery within 4 weeks prior to entry into the study
• Significant acute or chronic infections including human immunodeficiency virus (HIV) or known acquired immunodeficiency syndrome, Active hepatitis B virus (HBV) or hepatitis C virus (HCV) infection and active tuberculosis
• Chronic Obstructive Pulmonary Disease exacerbation or other respiratory illness requiring hospitalization
• Active autoimmune disease that has required systemic treatment in past 1 year (i.e., with use of disease-modifying agents, corticosteroids, or immunosuppressive drugs)
• Any prior systemic cytotoxic chemotherapy for their NSCLC or any antibody or drug targeting T-cell coregulatory proteins