CTLA4 and neoplasm: At day 35, when most of tumors of non-irradiated mice had grown out, there was a statistically significant difference in tumor size between mice that received SBRT and mice that received SBRT + IL-2, SBRT + α-CTLA-4/α-CD137, SBRT + α-PD-1/α-CD137 or SBRT + α-CD137.