To study the effect of the timing of surgery on outcome of patients with nonmetastatic osteosarcoma of pelvis and sacrum.

Successful therapeutic interventions to prevent disease progression in patients with nonmetastatic osteosarcoma of pelvis and sacrum have included surgery with adjuvant chemotherapy. Pre-surgical chemotherapy has been advocated for these patients because of putative improvement in event-free survival (EFS). The advantages of pre-surgical chemotherapy include early administration of systemic chemotherapy, shrinkage of primary tumor, and pathologic identification of risk groups. The theoretic disadvantage is that it exposes a large tumor burden to marginally effective chemotherapy, especially in the axial region. The contribution of chemotherapy and surgery timing has not been tested rigorously. To study the effect of the timing of surgery on outcome of patients with nonmetastatic osteosarcoma of pelvis and sacrum, we conducted multicenter randomized trial to determine whether chemotherapy administered before definitive resection of primary tumors improved EFS and overall survival compared with traditional resection of the primary tumor followed by adjuvant chemotherapy.

Inclusion Criteria:

• Age >10 years and <40 years;
• High-grade nonmetastatic osteosarcoma in pelvis or sacrum;
• Diagnosis confirmed histologically and reviewed centrally;
• No evidence of metastatic disease with computed tomography scan of the chest and radionuclide bone scan, or Positron Emission Tomography (PET/CT) within 2 weeks of entry;
• No prior therapy;
• Eastern Cooperative Oncology Group performance status 0-1;
• Life expectancy >3 months;
• Adequate renal, hepatic, and hemopoietic function;

Exclusion Criteria:

• Previously treated by chemotherapy or unplanned surgery in other hospital;
• Have had other kinds of malignant tumors at the same time;
• Uncontrolled complications, such as diabetes mellitus and so on;
• Intravascular tumor thrombus on enhanced CT or magnetic resonance (MR);
• Unresectable disease evaluated by surgeons.

Undecided