This disclosure provides a method for treating a subject afflicted with a lung cancer, which method comprises administering to the subject therapeutically effective amounts of: (a) an anti-cancer agent which is an antibody or an antigen-binding portion thereof that specifically binds to a Programmed Death-1 (PD-1) receptor and inhibits PD-1 activity and (b) another anti-cancer agent. The other anti-cancer agent can be a platinum-based doublet chemotherapy, an EGFR-targeted tyrosine kinase inhibitor, an anti-VEGF antibody, an anti-Cytotoxic T-Lymphocyte Antigen-4 (CTLA-4) antibody, or any other therapy used to treat lung cancer in the art or disclosed herein.