For which patients with Ewing sarcoma do you perform stem cell harvest during upfront therapy?

For which patients with Ewing sarcoma do you perform stem cell harvest during upfront therapy?

• All patients diagnosed with Ewing sarcoma
• Localized with poor histological response to induction chemotherapy
• Localized with large tumor volume
• Metastatic with pulmonary only disease
• Metastatic with extrapulmonary metastases
• Other