Pucotenlimab Combined With Lenvatinib and Chemotherapy in the Treatment of Advanced, Relapsed/Refractory Hepatoblastoma in Children

A total of 24 cases are planned to be enrolled. All subjects will receive Pucotenlimab (3mg/kg, on Day 1, with a maximum dose not exceeding 200mg) once every 3 weeks (Q3W), in combination with Lenvatinib and Irinotecan. The chemotherapy regimen is fixed: Lenvatinib capsules 7mg/m2 (maximum 12mg) orally from Day 1 to 21 and Irinotecan 50mg/m2 from Day 1 to 5. Chemotherapy will be administered for 2 to 4 cycles, once every 3 weeks (Q3W).