This study is a randomized, controlled, multicenter, prospective clinical trial with a planned enrollment of 74 patients, who will be randomly assigned in a 2:1 ratio. After enrollment, patients will receive either irinotecan liposomal injection combined with temozolomide and vincristine or irinotecan injection combined with temozolomide and vincristine. The aim is to evaluate the efficacy, safety, and impact on quality of life of the irinotecan liposomal combination regimen compared to the irinotecan injection combined with temozolomide and vincristine in the treatment of advanced Ewing's sarcoma.