RecruitingClinical trialPhase I/II Randomized Study of NBTXR3 Activated by Abscopal or RadScopal Radiation in Combination With Immunotherapy (Anti-PD-1/L-1) for Patients With Advanced Solid MalignanciesThis phase I/II trial studies the side effects and possible benefits of NBTXR3, radiation therapy, Anti PD-1 / PD-L1 in treating patients with solid tumor that has spread to the lung (lung metastases) and/or liver (liver metastases). NBTXR3 may help make tumor cells more sensitive to the radiation therapy. Radiation therapy uses high energy x-rays to kill tumor cells and shrink tumors. Immunotherapy with Anti PD-1 / PD-L1 monoclonal antibodies, such as nivolumab, may help the body's immune system attack the cancer, and may interfere with the ability of tumor cells to grow and spread. Giving NBTXR3, radiation therapy, Anti PD-1 / PD-L1 may help to control the disease.