Biomarker Analysis of Tislelizumab Combined With Chemotherapy for Perioperative Treatment of G/GEJ Adenocarcinoma

"Interventions include collecting samples, DNA panel test and full transcriptome sequencing.~Before collecting samples, obtaining written informed consent from patient in advance.~1. Blood cell samples;~2. Paraffin sample of residual tumor tissue of biopsy;~3. Paraffin sample of residual tumor tissue and paracancer tissue after gastrectomy."