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Sodium and zinc display opposite effects on immune cells, such as regulatory T cells (Tregs) and T helper 17 cells (Th17), resulting in an altered immune response. Immune cells have a pivotal role in regulating tumor progression, which may affect gastric cancer (GC) mortality. Thus, this cohort study investigated the associations between the combination of sodium and zinc intake and GC mortality and whether these associations differ by histological type by following up deaths of GC cases in Korea. A total of 490 patients with GC were enrolled between 2002 and 2006. Survival or death was prospectively followed up until December 31, 2016. Finally, 300 patients with the two main histological types of GC were included; 99 GC deaths occurred during a median follow-up period of 7.1 years. Patients with high sodium and low zinc intake had a significantly higher GC mortality than those with low sodium and high zinc intake (hazard ratio [HR], 2.07; 95% confidence interval [CI], 1.09–3.93). However, no significant association was found between the histological types of GC. In conclusion, we found that high sodium and low zinc intake may worsen the survival rate of patients with GC.

The Associations of Dietary Intake of High Sodium and Low Zinc with Gastric Cancer Mortality: A Prospective Cohort Study in Korea