RecruitingPhase 2Drug trialPhase II Study of Irinotecan Liposomes in First-line Treatment of Metastatic Colorectal CancerTo evaluate the objective response rate, disease control rate, progression-free survival, overall survival, surgical conversion rate and safety of irinotecan liposome combined with 5-FU/LV+ bevacizumab regimen in first-line treatment of advanced metastatic colorectal cancer patients.