CTLA4 and neoplasm: demonstrate this in their study, where they showed that anti-cytotoxic T-lymphocyte associated protein 4 (CTLA4) antibody treated mice had an enhanced tumor response to fractionated radiotherapy (30 Gy in 5 sessions or 24 Gy in 3 sessions) at the primary site and at the site outside of the radiation field (abscopal effect) [29].