RecruitingPhase 1Drug trialSafety, Tolerance and Preliminary Efficacy of XH001 Injection Combined With Neoantigen Vaccine-induced Tumor-specific T-cell Injection in Advanced Gastrointestinal CancerThe goal of this clinical trial is to learn the safety of tumor neoantigen vaccine combined with neoantigen vaccine induced T-cell in treating advanced gastrointestinal cancer in adults. It will also learn if the combined treatment works to treat advanced gastrointestinal cancer.The main questions it aims to answer are:What medical problems do participants have when using the combined treatment? Does tumor neoantigen vaccine combined with neoantigen vaccine induced T-cell eliminate or shrink the tumor, and can it prolong the patient's survival period?