Cosiporfin Sodium for Injection Photodynamic Therapy

Study Design: Multicenter, open-label, Single Group Study Population: Patients with locally advanced or recurrent metastatic extrahepatic cholangiocarcinoma who are inoperable or unwilling to undergo surgery. Primary Research Objective: To preliminarily evaluate the efficacy of photodynamic therapy (PDT) with sodium protoporphyrin combined with gemcitabine and cisplatin (GC regimen) chemotherapy in patients with advanced extrahepatic cholangiocarcinoma complicated by biliary obstruction. Secondary Study Objective: To preliminarily evaluate the safety and tolerability of photodynamic therapy (PDT) with heme porphyrin sodium combined with gemcitabine and cisplatin (GC regimen) chemotherapy in patients with advanced extrahepatic cholangiocarcinoma with biliary obstruction. Primary endpoint: 6-month overall survival rate (6m-OS rate)