Safety and Efficacy of Pembrolizumab in Combination with Bevacizumab + CapeOX in the Neoadjuvant Treatment of RAS-mutated, BRAF Wild-type, Microsatellite-stabilized, Locally Advanced Colorectal Cancer

"Pabolizumab is an lgG4 subclass monoclonal antibody humanized against PD-l molecules thatblocks the immune escape mechanism of cancer cells by inhibiting the PD-l receptor oflymphocytes, thereby allowing the immune system to destroy them.~In the single-arm study, all enrolled patients received a combination of chemotherapy and immunotherapy, as outlined below:~Pembrolizumab:~Day 1：Pembrolizumab injection 200mg was administered once and repeated every 21 days, expected to last 2-4 cycles. Two vials (200 mg) of pembrolizumab injection should be diluted into 100-200 mL of saline, and the infusion time should be more than 30 minutes.~Chemotherapy (CapeOX regimen):~Day 2: Bevacizumab (7.5 mg/kg) + Oxaliplatin (135 mg/m2) + Capecitabine (1 g/m2, did, d1-d14). Treatment repeated every 3 weeks (q3w) until disease progression or intolerable toxicity."