Maligant Solid Tumor

This study is a prospective, single-arm, open-label, dose-escalation study. A total of 4 dose groups were pre-defined in this study. The drug was administered once every 6 weeks.The drug would be administered for 1 to 4 cycles. The dosing schedule and dose could also be adjusted according to the patient's condition. After each dose group completed the enrollment and DLT observation, based on the participant's safety tolerance, radiation dosimetry, and preliminary efficacy evaluation results, it was decided whether to adjust the dose of the subsequent dose groups or to suspend the dose escalation.