Association between Age at Eradication and the Risk of Gastric Cancer Stratified by Family History of Gastric Cancer: A Nationwide Population-Based Study.

Introduction: This study compares the risk of GC according to age at eradication, stratified based on the presence of family history of GC using a population-based large cohort.

Method: We analyzed individuals who underwent GC screening between 2013 and 2014 and received eradication therapy before screening.

Results: Among 1,888,815 -treated patients, 2610/294,706 and 9332/1,594,109 patients with and without a family history of GC, respectively, developed GC. After adjusting for confounders, including age at screening, the adjusted hazard ratios (95% confidence intervals) for GC comparison, 70-74, 65-69, 60-64, 55-59, 50-54, 45-49, and <45 years with ≥75 years at eradication were 0.98 (0.79-1.21), 0.88 (0.74-1.05), 0.76 (0.59-0.99), 0.62 (0.44-0.88), 0.57 (0.36-0.90), 0.38 (0.22-0.66), and 0.34 (0.17-0.67), respectively, among patients with a family history of GC ( < 0.001) and 1.01 (0.91-1.13), 0.95 (0.86-1.04), 0.86 (0.75-0.98), 0.67 (0.56-0.81), 0.56 (0.44-0.71), 0.51 (0.38-0.68), and 0.33 (0.23-0.47), respectively, among patients without a family history of GC ( < 0.001).

Conclusion: In patients with and without a family history of GC, young age at eradication was significantly associated with a reduced risk of GC, suggesting that the early treatment of infection can maximize GC prevention.