This is a phase II study to investigate the efficacy of biweekly bevacizumab in combination with modified-FOLFOXIRI regimen, as first-line chemotherapy in patients with borderline resectable colorectal liver metastases. Borderline resectable liver metastases are considered to have poor-risk diseases infeasible for upfront resection, but own the potential for resection after down-staging. The primary purpose of the study is to determine the resection rate of liver metastases in patients receiving this combination regimen. The secondary objectives are to determine the response rate, progression free survival, overall survival, and safety profiles.~Eligible patients will receive a triplet chemotherapy consisting of bevacizumab (5 mg/kg) plus modified-FOLFOXIRI (irinotecan 150 mg/m2, oxaliplatin 85 mg/m2, leucovorin 200 mg/m2, and fluorouracil 2400 mg/m2 as a 46-h continuous infusion) every 14 days as a cycle. Resectability of primary tumor and liver metastases will be assessed after five cycles of combination treatment with feasible image exams. Patients with progressive disease will be discontinued in this study. For patients feasible for tumor resection, the modified triplet chemotherapy without bevacizumab combination will be continued for one other cycle for patients before surgery. If patients don't reach both the feasibility of tumor resection and progressive disease, another four cycles of bevacizumab combined with modified-FOLFOXIRI could be continued by investigator's judgement. Reassessment of resectability for primary tumor and liver metastases will be conducted using feasible image exams after a total of 9 cycles of combination treatment in these patients. Similarly, the triplet chemotherapy without bevacizumab combination will be continued for the other one cycle before surgery for these patients feasible for tumor resection after reassessment. Bevacizumab should be stopped at least 4 weeks before the planned day of surgery. Short-course radiotherapy will be allowed before surgery for patients with rectal cancer. All patients will be discontinued in this study after tumor resection. Treatment will also be discontinued if the patient requests or the investigator decides that therapy should be withdrawn. Further tumor treatment after treatment discontinuation will be decided based on investigator's judgement with the best knowledge.
This single-arm study will evaluate the resection rate of liver metastases in patients with metastatic colorectal cancer and borderline unresectable liver metastases receiving treatment with bevacizumab in combination with modified-FOLFOXIRI as first line treatment. Patients will receive bevacizumab (5 mg/kg) plus modified-FOLFOXIRI (irinotecan 150 mg/m2, oxaliplatin 85 mg/m2, leucovorin 200 mg/m2, and fluorouracil 2400 mg/m2 as a 46-h continuous infusion) every 14 days as neoadjuvant chemotherapy regimen. This study treatment will continue until surgery, disease progression, unacceptable toxicity, or patient refusal.