Figure 1.

Trial schema

Twenty-two stage IV patients with metastatic melanoma were stratified by treatment site of a single index metastasis, which is the irradiated tumor. Two dosing levels for hypofractionated radiation (HFRT) are in each stratum. After enrollment, 2 or 3 fractions of HFRT were given over 3–7 days (red arrows). Ipilimumab (3 mg/kg) was initiated within 7 days of the final HFRT fraction, every 3 weeks x 4 (blue arrows). s.c – subcutaneous