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Jianming Wei,1,* Xibo Gao,2,* Yulan Qin,3 Tong Liu,1 Yani Kang3 1Department of General Surgery, Tianjin Medical University General Hospital, Tianjin 300052, People’s Republic of China; 2Department of Dermatology, Tianjin Children’s Hospital, Tianjin 300074, People’s Republic of China; 3School of Biomedical Engineering, Bio-ID Center, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China*These authors contributed equally to this workCorrespondence: Yani Kang Tel +86-21-3420-7324Email kangyani@sjtu.edu.cnPurpose: Gastric cancer (GC) is a type of malignant cancer with a poor prognosis. The iron’s metabolism plays an important role in the process of GC. The aim of this study was to evaluate the effectiveness of SLC22A17, associated with iron metabolism, in predicting the prognosis of GC patients.Materials and Methods: We analyzed genes related to iron metabolism of gastric cancer mRNA-seq data from TCGA database. We identified an iron metabolism-related SLC22A17 as an independent prognostic factor using univariate and multivariate Cox regression analysis.Results: Further research showed that SLC22A17 was related with many pathways involved in the process of gastric cancer, and the expression was associated with diverse cancer-infiltrating immune cells. The expression of SLC22A17 was associated with T (Topography).Conclusion: We validated that SLC22A17 associated with iron metabolism could serve as a prognostic biomarker for GC patients.Keywords: gastric cancer, iron metabolism, SLC22A17, prognostic marker