A Study of Pembrolizumab Plus Local Chemotherapy Using Isolated Limb Infusion (ILI) for Patients With Sarcoma in the Arm or Leg

ILI will be performed within 18 days of initiation of pembrolizumab. ILI (infusion of melphalan and dactinomycin into the affected limb via arterial catheter) will be performed in the interventional radiology suite under anesthesia. In pediatric patients, the pediatric pharmacist w ill be consulted prior to the procedure, and an appropriate prophylactic anti-emetic therapy and dose will be selected for the individual patient.

Pembrolizumab at a dose of 200 mg will be administered intravenously on Day 1 and every 3 weeks(+/= 3 days) thereafter. In adolescent patients, the dosing of pembrolizumab w ill be 2 mg/kg up to a maximum of 200 mg.

infusion of melphalan and dactinomycin