Inclusion criteria
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1. Diagnosis of advanced metastatic colorectal cancer by pathology and/or cytology (diagnosis of simultaneous metastasis and postoperative recurrence of atypical metastasis, previous adjuvant chemotherapy or radiotherapy with atypical metastasis for more than 3 months were included);
2. Aged 18 ~ 75 years(including boundary value), male or female;
3. ECOG PS score 0-2; [Zubrod-Ecog-Who (ZPS, 5-point method)];
4. Expected survival >= 3 months;
5. Subject has a measurable target lesion examined by CT or MRI or PET-CT according to RECIST 1.1 criteria;
6. Signed the informed consent.
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Exclusion criteria:
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1. Prepare for tumor immunotherapy and/or radiation therapy;
3. Patients with unstable brain metastases with cerebral edema;
4. Pregnant and lactating women and patients of reproductive age who do not want to take contraceptive measures;
5. Patients with mental illness or low intelligence;
6. Known allergy or intolerance to the study drug;
(1) Absolute neutrophils count (ANC) < 1.5 x 10^9/L, or platelet count (PLT) < 100 x 10^9/L, or hemoglobin < 90g/L; Blood transfusion was not allowed within 1 week before enrollment; 2. Serum total bilirubin > 1.5 x upper normal limit (ULN); AST(SGOT)/ALT(SGPT) > 2.5 x upper normal limit, >= 5 times upper normal limit if it is clearly attributed to liver metastasis; 3. Creatinine clearance rate < 50mL/min; Clinically significant electrolyte abnormalities; Urine protein test results >= 2+ or urine protein volume >= 1.0g/24h); Cardiac function grade III-IV (NYHA grading).
8. Has been in the past 4 weeks or is participating in other clinical trials;
9. Failure to recover from the toxicity of previous anticancer therapy (NCICTCCAE > grade 1, including oxaliplatin induced hair loss and neurotoxicity <= 2), failure to fully recover from previous surgery, or the duration of previous anticancer therapy or surgery is less than 4 weeks;
10. Subjects with clinically detectable second primary malignancies or other malignancies within the last 5 years at the time of enrollment (excluding adequately treated basal cell carcinoma of the skin or carcinoma in situ of the cervix);
11. Clinically uncontrolled active infections, such as acute pneumonia, active hepatitis B, hepatitis B, etc. (previous history of hepatitis B virus infection, with or without drug control, HBV DNA >= 10^4 copies /ml or >= 2000IU/ ml);
12. Difficulty swallowing or malabsorption of medication;
13. Coagulation dysfunction, bleeding tendency or obvious bleeding history after receiving anticoagulant therapy;
14. Arterial/venous thromboembolic events, such as cerebrovascular accidents (including transient ischemic attack), occurred within 12 months prior to initial treatment.
15. Acute myocardial infarction, acute coronary syndrome, or coronary bypass grafting within 6 months prior to initial treatment;
16. A fracture or wound remains unhealed for a long time;
17. Patients with brain metastases, digestive tract diseases, peritoneal and mesenteric diseases, and nervous system diseases that can cause non-chemotherapy-related nausea and vomiting;
18. Nausea and vomiting within 24 hours before chemotherapy;
19. Complications include one of the following symptoms: uncontrolled hypertension (uncontrolled hypertension with monotherapy, i.e., systolic blood pressure > 140mmHg or diastolic blood pressure >90mmHg after monotherapy), coronary artery disease, arrhythmias, and heart failure.
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