Cure Alveolar Soft Part Sarcoma International (iCureASPS)

Department of Orthopaedic Surgery, University of Pittsburgh Medical Center advocates an aggressive surgery for the pelvic located mets - looks like the good place to contact if you have them as they are more likely to agree to resect them based on their positive experience with the outcomes.

Should Aggressive Surgical Local Control Be Attempted in All Patients with Metastatic or Pelvic Ewing's Sarcoma?
http://www.ncbi.nlm.nih.gov/pubmed/22550427