Lymphoma RadVax LYMPHOMA: A PHASE II TRIAL OF NIVOLUMAB + LOW DOSE RADIOTHERAPY FOR INCOMPLETE RESPONDERS

Nivolumab 3 mg/kg will be administered on day 1 (pre-response assessment week 0) and on day 1 and continued per standard of care and institutional practices. At the week 1 biomarker collection, research FDG PET/CT will be performed to assess for FDG "flare." At week 8-12, PET/CT will be performed for the first response assessment. If a complete anatomic response is seen, nivolumab monotherapy will be continued on day 1 and continued per standard of care and institutional practices. By contrast, if at week 8 less than a complete anatomic response is seen, radiotherapy to 4 Gy x 2 fractions will be administered (post-response assessment week 0). The patient will be evaluated by a radiation oncologist while on treatment, and toxicities will be recorded. Nivolumab will be continued on day 1 and continued per standard of care and institutional practices. In either scenario, a second response assessment will be conducted \~8-12 weeks after the first response assessment. In either scenario, nivolumab monotherapy will be continued at the discretion of the treating medical oncologist. If there is less than CR post-RT and there is an additional untreated non-target lesion that can be followed, radiotherapy can again be administered when disease progresses to a previously untreated lesion, after which the patient will continue on the post-RT follow-up algorithm.