A Global Study to Assess the Effects of MEDI4736 Following Concurrent Chemoradiation in Patients With Stage III Unresectable Non-Small Cell Lung Cancer

Inclusion Criteria: 1. Age at least 18 years. 2. Documented evidence of NSCLC (locally advanced, unresectable, Stage III) 3. Patients must have received at least 2 cycles of platinum-based chemotherapy concurrent with radiation therapy. 4. World Health Organisation (WHO) Performance Status of 0 to 1. 5. Estimated life expectancy of more than 12 weeks. Exclusion Criteria: 1. Prior exposure to any anti-PD-1 or anti-PD-L1 antibody. 2. Active or prior autoimmune disease or history of immunodeficiency. 3. Evidence of severe or uncontrolled systemic diseases, including active bleeding diatheses or active infections including hepatitis B, C and HIV. 4. Evidence of uncontrolled illness such as symptomatic congestive heart failure, uncontrolled hypertension or unstable angina pectoris. 5. Any unresolved toxicity CTCAE \>Grade 2 from the prior chemoradiation therapy. 6. Active or prior documented inflammatory bowel disease (eg, Crohn's disease, ulcerative colitis).