NREP is a Diagnostic and Prognostic Biomarker, and Promotes Gastric Cancer Cell Proliferation and Angiogenesis.

Neuronal regeneration related protein (NREP), also known as P311, has been reported to participate in multiple biological processes. The detection of tumor biomarker favored a non-invasive early entry for cancer diagnosis and disease monitoring to prevent its worsening symptoms. This study is intended to investigate the clinical roles of NREP in gastric cancer (GC) and its effect on gastric cancer cell proliferation and angiogenesis. Our results demonstrated that NREP was typically upregulated in GC tissues compared with normal control. The Kaplan-Meier analysis showed correlations between increased NREP level and poor survival, indicating the prognostic value of NREP in GC patients. The expression levels of NREP varied by races, clinical T stages, and histologic grades. NREP expression was associated with tumor-associated immune infiltration. The NREP expression was powerfully associated with clinical characteristics of GC patients, in particular, with T stage and histologic grade. Gene ontology and KEGG signaling analysis indicated that NREP-related genes were predominantly enriched in various pathways. Additionally, knockdown of NREP inhibited human gastric adenocarcinoma cell proliferation and angiogenesis. Collectively, our results suggested that NREP may be an excellent biomarker for the clinical diagnosis, prognosis, and therapy of GC.