Neoadjuvant Therapy （NALIRIFOX） for Locally Advanced Colon and Upper Rectal Cancer

The goal of this clinical trial is to evaluating the efficacy and safety of Oxaliplatin + Irinotecan Liposome + 5-FU/LV in patients with Locally Advanced Colorectal Cancer and Upper Rectal Cancer. Patients would be included as:1. Aged between 18-75 years, with no gender restrictions; 2. Biopsy pathology confirmed as advanced colon cancer and upper rectal cancer; 3. Clinical staging of T3N+ or T4Nany with initially resectable tumors; 4. No distant metastasis observed in routine chest and abdominal CT scans. The main question it aims to answer is Major Pathological Response Rate, referring to the proportion of patients who experience a significant reduction in the size of their tumor or near-complete pathological regression after treatment, typically assessed through a biopsy or surgical resection. Participants will be Chemotherapy administered before surgery, with 3-6 cycles of treatment, using the chemotherapy regimen of Oxaliplatin + Irinotecan Liposome + 5-FU/LV.