This 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.
Males and/or females over age 18
Histologically and/or cytologically documented metastatic colorectal cancer confirmed .
Eastern Cooperative Oncology Group (ECOG) performance status of 0-1.
Expected survival >=12 weeks.
Known uncontrolled or symptomatic central nervous system metastatic disease.
Adverse events (with exception of alopecia and fatigue) from any prior anticancer therapy of grade >1 (National Cancer Institute Common terminology Criteria [NCI CTCAE] v.5.0).
Inadequate organ or bone marrow function.
Pregnant or breast-feeding woman.
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Treatment groupsSee each treatment group below.