This study is researching an investigational drug, called BNT116, in combination with cemiplimab. BNT116 and cemiplimab will each be called a "study drug", and together be called "study drugs". The study is focused on patients who have advanced non-small cell lung cancer (NSCLC). The aims of this study are to see how safe and tolerable BNT116 is in combination with cemiplimab and to see how effective BNT116 in combination with cemiplimab is compared to cemiplimab by itself at treating cancer. The study is looking at several other research questions, including: * What side effects may happen from receiving the study drugs * How much study drug is in the blood at different times * Whether the body makes antibodies against the study drug(s) (which could make the drug less effective or could lead to side effects)