A Phase II/III Study of HR070803 in Combination With Oxaliplatin, 5-fluorouracil, Calcium Folinate and Bevacizumab Versus FOLFOX in Combination With Bevacizumab for First-line Treatment of Advanced Colorectal Cancer

Inclusion Criteria:

1. Male or female who is 18-75 years of age;
2. Histologically-confirmed metastatic and unresectable (Stage IV as defined by American Joint Committee on Cancer \[AJCC eighth edition\]) colorectal adenocarcinoma
3. No previous systemic antitumor therapy (including but not limited to systemic chemotherapy, molecularly targeted therapy, immunotherapy, biotherapy, and other investigational therapeutic agents) for colorectal cancer (patients with confirmed relapse ≥6 months after the last administration of neoadjuvant or adjuvant therapy can be enrolled);
4. Has an Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 1 ;
5. Life expectancy of ≥ 6 months;
6. Vital organ functions meet the criteria.

Exclusion Criteria:

1. With confirmed MMR deficient (dMMR) or microsatellite instability high (MSI-H).
2. With central nervous system metastases.
3. Previous oxaliplatin-containing chemotherapy within 12 months prior to enrolment.
4. Previous treatment with irinotecan, immune checkpoint inhibitor, anti-epidermal growth factor receptor or any anti-angiogenic drug.
5. Patients with large amount of pleural effusion, ascites or pericardial effusion that could not reach a stable state within 2 weeks prior to enrolment.
6. Severe gastrointestinal dysfunction (inflammation or diarrhea \> grade 1).
7. With diagnosed interstitial lung disease.
8. Severe cardiovascular and cerebrovascular diseases.
9. Peripheral neuropathy \> grade 1.
10. Intestinal obstruction within the 6 months prior to enrolment.
11. Gastrointestinal perforation, gastrointestinal fistula, intraperitoneal abscess, and non-gastrointestinal fistula (e.g. tracheoesophageal fistula) within 6 months prior to enrolment.
12. Patients with CTCAE≥ grade 3 gastrointestinal bleeding within 6 months prior to enrolment, or any grade gastrointestinal bleeding within 1 month prior to enrolment.
13. Patients with CTCAE≥ grade 3 extra-gastrointestinal bleeding within 6 months prior to enrolment, or CTCAE≥ grade 2 extra-gastrointestinal bleeding within 3 months prior to enrolment.
14. Uncontrolled hypertension (systolic blood pressure ≥140 mmHg and/or diastolic blood pressure ≥90 mmHg under regular antihypertensive therapy), and a history of hypertensive crisis or hypertensive encephalopathy.
15. History of hypersensitivity or contraindications to any of irinotecan liposomes/simulator, irinotecan, other liposomal products, 5-FU, calcium folinate, oxaliplatin, bevacizumab.