Expanded Access Use of L-MTP-PE for the Treatment of Osteosarcoma

Inclusion Criteria: * Confirmed diagnosis of osteosarcoma of any age Note: Patients with either newly diagnosed or relapsed osteosarcoma are eligible. * Surgical resection or other definitive local control therapy of all clinically detectable sites of osteosarcoma * L-MTP-PE is deemed to be of potential benefit by the treating investigator * Willing and able to understand and sign informed consent and assent as appropriate * Life expectancy \> 6 weeks * Adequate organ function as follows: * Adequate bone marrow function defined as: * absolute neutrophil count (ANC) ≥ 750/mm\^3 * platelet count ≥ 30,000/ mm\^3 * hemoglobin ≥ 8 g/dl * Adequate renal function defined as: * Creatinine clearance or radioisotope glomerular filtration rate ≥ 70 mL/min/1.73m\^2 OR * Serum creatinine ≤ 2x the upper limit of normal based on age/gender * Adequate liver function defined as: * Bilirubin (sum of conjugated + unconjugated) ≤ 2x upper limit of normal for age or ≤ 4x upper limit of normal if thought to have Gilbert's disease * AST or ALT ≤ 3x upper limit of normal or ≤ 5x upper limit of normal for patients with liver metastases * Willing to use a barrier method of contraception throughout the course of the study and for 1 year after participation if relevant Exclusion Criteria: * Use of chronic steroids of other immunosuppressive agents * Pregnant or breast feeding