RecruitingPhase 2Drug trialEvaluation of Irinotecan Liposome (II) Combined With 5-FU, LV, and Bevacizumab for mCRCTo observe and evaluate the efficacy and safety of irinotecan liposome (II) combined with 5-fluorouracil(5-FU), calcium leucovorin(LV), and bevacizumab in the treatment of metastatic colorectal cancer.