Overview Multi-omics Sequencing in Neoadjuvant Immunotherapy of Gastrointestinal Tumors Status: Not yet recruiting Trial end date: 2025-12-31 Target enrollment: Participant gender: Summary immunotherapy,gastric cancer,rectal cancer,biomark Phase: Phase 2 Details Lead Sponsor: Daping Hospital and the Research Institute of Surgery of the Third Military Medical UniversityTreatments: Trastuzumab