Study PI is leaving UAB and no longer opening study.

This is a single center, single arm phase I clinical trial exploring the feasibility and safety of performing transarterial embolization of incurable hypervascular pediatric soft tissue sarcomas with at least an index tumor with 50% arterial enhancement and a 3mm feeding vessel on pre study evaluation. The target study sample size is 10 tumors in a requisite number of participants. These patients will be enrolled to undergo evaluation of all angiographically visible tumors >3cm with subsequent bland (not adsorbed to radioactive or chemotherapy) particle embolization of at least 25% perfusion to the target tumor.

The study will include a screening period in which patient eligibility is determined. Once enrolled parents and patients over 5 years of age will complete a quality-of-life survey PedsQL with a dedicated cancer module and visual analog scale questions for pain and procedural satisfaction. Approximately 2 weeks later the patient will undergo angiography and embolization where feasible. The patient will return for a post-procedural clinic visit at 2-weeks post intervention to assess for adverse effects and complete a follow up PedsQL and VAS surveys. If a major safety event is identified an independent reviewer will review all interim procedures to assess whether excess adverse events have occurred, and the study should be terminated. If this is exceeded the study will be aborted. The patient and parents will also complete PedsQL and VAS surveys in weeks 12- and 24-weeks post intervention. Follow up Computerized Tomography (CT) or Magnetic Resonance Imaging (MRI) concordant with baseline imaging modality will also be performed at weeks 12 and 24 to assess tumoral response.

Inclusion Criteria:

• Pediatric patient aged 2-18 years, weighing at least 20 kg
• Diagnosed with biopsy proven primary or metastatic soft tissue sarcoma designated as a non-curative surgical candidate and/or failure of standard of care chemotherapy/immunotherapy with local progression on 3-month post induction imaging
• Staging CT or MRI demonstrating at least 50% arterial vascularity by volume within at least one tumor measuring at least 3 cm in longest dimension with an identifiable arterial feeder within one month of screening visit

Exclusion Criteria:

• Negative pregnancy test within 48 hours of angiography or lactation for females of childbearing age
• Known anaphylactic allergic reactions to iodinated contrast
• Planned surgery or radiation to the target site within the study period at time of enrollment