Evaluate the objective response rate (ORR) of AK104 combined with chemotherapy and cetuximab or bevacizumab in second-line treatment of MSS type advanced colorectal cancer
1. Voluntarily sign a written ICF. 2. Age at enrollment: ≥ 18 years old, ≤ 75 years old, both male and female. 3. The Eastern Cancer Collaborative Organization (ECOG) has a physical fitness score of 0 or 1.
1. Patients with known MSI-H or dMMR. 2. Patients with BRAF mutations. 3. Subjects suffered from other malignant tumors within 3 years before enrollment, except for cured local tumors (such as basal cell skin cancer, squamous cell skin cancer, superficial bladder cancer, cervical carcinoma in situ, etc.).