Safety and Efficacy of Pucotenlimab in pLECC

A total of 33 cases are planned to be enrolled. All the subjects will receive Pucotenlimab (3mg/kg, on day 1, with a maximum dose not exceeding 200mg), administered once every 3 weeks (Q3W), and combined with the GP regimen. The chemotherapy is a fixed regimen, with Gemcitabine at a dose of 1g/m² on day 1 and day 8, and cisplatin at a dose of 80mg/m² on day 1. The chemotherapy will be given for 3 to 6 cycles, once every 3 weeks (Q3W).