Experimental group:Potlilimab+Lenvatinib+ Irinotecan Injection

Pucotenlimab Combined with Lenvatinib and eribulin in Patients with Advanced Melanoma Failed in First-Line Therapy, a Single-Arm, Open-Label, Multicenter, Phase II Clinical Study

Pucotenlimab Combined with Lenvatinib and eribulin in Patients with Advanced Sarcoma Failed in First-Line Therapy, a Single-Arm, Open-Label, Multicenter, Phase II Clinical Study