RecruitingPhase 2Drug trialA Phase 2 Study of SSGJ-707 in Metastatic Colorectal Cancer PatientsThis study includes two parts:Part 1: SSGJ-707 (different dosing regimens) in combination with chemotherapy for first-line treatment of metastatic colorectal cancer.Part 2: SSGJ-707 in combination with chemotherapy versus bevacizumab in combination with chemotherapy for first-line treatment of metastatic colorectal cancer.