This is a phase 2 clinical trial of nivolumab combined with ipilimumab in subjects with rare cancers. This study will allow an evaluation of the clinical benefit, as measured by progression free survival (PFS) and overall survival (OS), provided by nivolumab combined with ipilimumab. If the safety profile is acceptable and clinically efficacy is seen, this study would support the use of nivolumab combined with ipilimumab in subjects with these cancers.