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Partial responses in two patients in cohort D (nivolumab 3mg/kg plus ipilimumab 1mg/kg. A) Partial response in rhabdomyosarcoma after 4th cycle B) Partial response in Ewing sarcoma after 3rd cycle. C) Immunohistochemistry demonstrates infrequent PD-L1+ cells in Ewing sarcoma tumor tissue from diagnosis.
