Immune Checkpoint Inhibitors + Chemotherapy Versus Chemotherapy in the Neoadjuvant Treatment of Locally Advanced Colorectal Cancer

The goal of this clinical trial is to compare the efficacy and safety of the combination of immune checkpoint inhibitors (ICIs) and FOLFOX regimen compared to FOLFOX regimen alone in the neoadjuvant chemotherapy of locally advanced colorectal cancer. The main question aims to answer are: Question 1: Compare the pathological complete response rate between the combination of ICIs and FOLFOX regimen and the FOLFOX alone. Question 2: Compare the survival outcomes and safety between the combination of ICIs and FOLFOX regimen and the FOLFOX alone. Two groups of participants will receive different new adjuvant chemotherapy regimens, and their efficacy will be compared.