Probing the Magic Role of NAD+ Metabolism-associated Genes in Gastric Cancer
1. Introduction
Gastric cancer (GC) represents a global health-care challenge, which is the fifth most common cancer and the fourth leading cause of cancer death across the world in 2020, with a significant incidence rate. Despite the efficacy of improved chemotherapy and surgical options, the prognosis of GC patients remains unsatisfactory.
Remarkably, NAD+ is an intriguing target for cancer therapy by leverage of its impacts upon energy metabolism and pathway regulation. This research is engineered to probe into the magic roles of NAD+ metabolism-associated genes (NMRGs) in GC.
2. The establishment of prognostic risk model for GC patients
Based on the expression levels of NAD+ metabolism-related genes in GC cell lines, a prognostic model is established for GC patients. 
Simply put, a total of 13 lncRNAs related to NMRGs are singled out by LASSO regression to construct prognostic risk model, with seven markedly up-regulated lncRNAs and six prominently down-regulated lncRNAs in GC tissues, as confirmed by real-time polymerase chain reaction. On this basis, six lncRNAs with the minimum likelihood of deviance corresponding to the first-rank value of Log (k) are chosen, followed by the plotting of model AUC and calculation of the risk score. The detailed calculation formula is listed below: risk score = AL139147.1 × (0.416) + AC107021.2 × (0.3119) + AC090825.1 × (0.1218) + AC005726.2 × (−0.0.0062) + AC012615.1 × (−0.0130) + AP001107.6 × (−0.0451). It is found that patients with high-risk scores have a poor prognosis.
3. The correlation between immune factors and risk scores
The levels of immune cell infiltration, including CD8 T cells, CD4 naïve T cells, CD4 memory-activated T cells, B memory cells, and naïve B cells, are markedly associated with risk scores. Besides, high-risk patients show activated immune checkpoints as well as high immune and stromal scores. 
4. The role of NAD+ in the metabolism of GC patients
NAD+ not only promotes GC progression, but also promotes immune cell infiltration into tumors. The modulation of NAD+ is significant for the metabolism of GC patients.
5. Conclusion
NMRGs may be promising biomarkers for predicting clinical outcomes of GC patients and ultimately facilitating their precise management.
Reference
Sun, X., Wen, H., Li, F., Bukhari, I., Ren, F., Xue, X., Zheng, P., & Mi, Y. (2023). NAD+ associated genes as potential biomarkers for predicting the prognosis of gastric cancer. Oncology research, 32(2), 283–296. https://doi.org/10.32604/or.2023.044618
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