CMAB009 Combined With FOLFIRI First-line Treatment in Patients With RAS/BRAF Wild-type, Metastatic Colorectal Cancer

Inclusion Criteria:

1. Males or females, Aged ≥18 years and ≤75 years
2. Diagnosis of histologically confirmed adenocarcinoma of the colon or rectum
3. First occurrence of metastatic disease(not curatively resected)
4. RAS/BRAF wild-type status in tumor tissue
5. At least one measurable lesion by computer tomography(CT) or magnetic resonance imaging (MRI)according to RECIST1.1 criteria (not in an irradiated area)
6. Eastern Cooperative Oncology Group(ECOG)performance status of 0 or 1 at trial entry
7. Life expectancy of at least 3 months
8. Medically accepted effective contraception if procreative potential exists(applicable for both male and female subjects until at least 90 days after the last dose of trial treatment)
9. Recovery from relevant toxicity due to previous treatment before trial entry
10. Signed the informed consent form voluntarily

Exclusion Criteria:

1. Radiotherapy or surgery（excluding prior diagnostic biopsy）in the 30 days before trial treatment
2. Hepatic, marrow, liver and renal function as follows:

   Marrow: white blood cell count \<3.0 × 109/L with neutrophils\<1.5 × 109/L, platelet count\<100×109/L and hemoglobin\<90 g/L; Liver function: Total bilirubin \>1.5 × upper limit of reference range; Aspartate transaminase (AST) and alanine transaminase (ALT) \> 2.5 × upper limit of reference range , or\> 5 × upper reference range in subjects with liver metastasis; Renal function: Serum creatinine \>1.5 × upper limit of reference range, or creatinine clearance\<50 mL/min
3. Previous chemotherapy for CRC adjuvant treatment if terminated \<12 months before diagnosis of recurrence or metastatic disease
4. Previous treatment with anti-EGFR monoclonal antibody, epidermal growth factor receptor tyrosine kinase inhibitor, or other EGFR targeted inhibitors(such as cetuximab, Nimotuzumab, or panitumumab)
5. Known hypersensitivity or allergic reactions against any of the components of the trial treatments
6. History of organ allograft, autologous stem cell transplantation, or allogeneic stem cell transplantation
7. Other non-permitted concomitant anti-cancer therapies
8. Known brain metastasis and/or leptomeningeal disease
9. Previous malignancy other than CRC in the last 5 years except basal cell cancer of the skin or preinvasive cancer of the cervix
10. Participation in another clinical trial within the past 30 days
11. Concurrent chronic systemic immune therapy or hormone therapy except physiologic replacement
12. Any unstable systemic disease, such as active infection, uncontrolled hypertension, unstable angina pectoris, angina in the last 3 months, cardiac failure of New York Heart Association classes ≥II, history of myocardial infarction, serious cardiac arrhythmias that require drug treatment, liver, kidney or metabolic disease in the last 6 months
13. Acute or sub-acute intestinal occlusion or history of inflammatory bowel disease
14. severe bone marrow function failure
15. Any disease, metabolic disorders, or physical/laboratory examination suspected, or patients with high risk of complications
16. Known and declared history of human immunodeficiency virus(HIV)infection
17. HBV-DNA \>1.0 × 103copy
18. Pregnancy or breastfeeding
19. Alcohol or drug abuse
20. Legal incapacity or limited legal capacity