Due to the company's development strategy adjustment, Innovent Biologics has decided not to continue this study after consultation with investigators.

The purpose of this study is to evaluate the safety and efficacy of IBI318 (anti-PD-1/PD-L1) in adult participants with metastatic (nodal or distant) cutaneous squamous cell carcinoma (CSCC), or unresectable locally advanced CSCC that is not amenable to surgery and/or radiation.

Inclusion Criteria:

1. Able to understand and willing to sign the ICF.
2. Adults 18 years of age or older.
3. Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1.
4. Life expectancy at least 12 weeks.
5. Adequate organ and bone marrow function.
6. Histologically confirmed diagnosis of invasive CSCC. .

Exclusion Criteria:

1. Prior treatment with an agent that blocks the PD-1/PD-L1 pathway.
2. Any investigational drugs received within 4 weeks prior to the first study treatment.
3. Receive the last dose of anti-tumor therapy within 4 weeks before the first dose of study therapy.
4. History of autoimmune disease , present active autoimmune disease or inflammatory diseases
5. Pregnant or nursing females.