Neoantigen-based Peptide Vaccine and Conventional Second-line Therapy for CRC Progressed After First-line Treatment

In this study, the investigators provide a combined treatment of personalized tumor neoantigen-based peptide vaccine and conventional second-line therapy to patients with colorectal cancer (CRC) progressed after first-line treatment. The investigators observe the objective response rate (ORR), disease control rate (DCR), adverse event (AE), serious adverse event (SAE), progression-free survival (PFS), and overall survival (OS) , aiming to evaluate the effectiveness and safety of the treatment.