The aim of this clinical study is to determine the efficacy and safety of the liposomal mitoxantrone combination regimen in treating relapsed and refractory solid tumors among children, adolescents, and young adults. The key questions it intends to address are: Can the liposomal mitoxantrone combination regimen improve the objective response rate (ORR) compared to historical data? What are the adverse events associated with this combination regimen? Researchers will administer the liposomal mitoxantrone combination regimen (including capecitabine and anlotinib with specific dosing regimens) to the participants and closely monitor their conditions. Participants will: Receive the treatment regimen for 4 - 6 cycles, with each cycle lasting 21 days Undergo regular checkups and tests during the treatment period and follow-up period as per the protocol. Have their tumor status, blood parameters, and other relevant indicators measured to evaluate the treatment effect and safety.
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Rate of Objective response(ORR)
Timeframe: Up to 6 cycles of chemotherapy (each cycle is 21 days)