The purpose of this study is to compare the usual treatment alone (radiation and chemotherapy) to adding maintenance nivolumab to the usual treatment. The addition of nivolumab to the usual treatment could shrink your cancer or prevent it from returning. But, it could also cause side effects, which are described in the risks section below. This study will help the study doctors find out if this different approach is better than the usual approach. To decide if it is better, the study doctors will be looking to see if the nivolumab increases the lifetime of the patient without progression for 10 years. This immunotherapy drug, nivolumab, is already approved by the FDA for use in advanced and incurable head and neck cancer. But, most of the time it is not used until the cancer is very advanced and chemotherapy stops working. In this study we believe the use of nivolumab has a chance of preventing the cancer from coming back for patients with your type of cancer. There will be about 286 people taking part in the first part (phase II) of the study and 458 more people taking part in second part (phase III), if the results of the phase II portion are promising and if there is evidence that nivolumab may prolong your life.

The purpose of this study is to compare the usual treatment alone (radiation and chemotherapy) to adding maintenance nivolumab to the usual treatment.