Fruquintinib Combined With Adebrelimab and High and Low Dose Radiotherapy in the Treatment of Second-line and Above Failure MSS Metastatic Colorectal Cancer.

After receiving high and low dose radiotherapy on metastases, the enrolled patients will receive the combination of Fruquintinib and Adebrelimab. RECIST 1.1 standard was used for clinical tumor imaging evaluation every 6 weeks (±7 days). For complete response (CR) ,partial response (PR), or stable disease (SD), the enrolled patients will continue to receive the combination of Fruquintinib and Adebrelimab. Participants will receive the combination of Fruquintinib and Adebrelimab until disease progression or intolerable toxicity occurred.