Gum disease linked to higher gastric cancer risk in major study
Gum disease may raise the risk of developing gastric cancer by up to 25 per cent, according to new research published in BMC Medicine. The large-scale study is the first to use sibling-controlled comparisons to examine how poor dental health may contribute to stomach cancer risk.
Researchers from Southeast University’s School of Public Health in China analyzed nationwide health and dental records of nearly 5.8 million Swedish adults aged 19 and older. Participants were followed for an average of 6.4 years between 2009 and 2016. During this period, 3,993 cases of gastric cancer were identified, including 1,241 cases of cardia gastric cancer, which affects the upper part of the stomach.
Key findings of the study
- Individuals with periodontitis (gum disease) had an 11 per cent higher risk of developing gastric cancer compared to those with healthy teeth.
- For cardia gastric cancer specifically, the risk increased by 25 per cent.
- Sibling-controlled analyses confirmed that the association between gum disease and gastric
- cancer was independent of shared genetic and early-life environmental factors.
- A dose-response relationship was observed between tooth loss and gastric cancer risk—fewer teeth were linked with a higher risk.
- However, having both gum disease and fewer teeth did not appear to further increase the risk.
The researchers noted: “Promoting dental health in the general population could have significant public health implications in preventing this disease.”
Why the study is significant
Unlike previous studies, which were often limited by small sample sizes and retrospective designs, this research combined comprehensive nationwide health and dental records with a robust study design. The sibling-controlled method provided stronger evidence of the oral-systemic health connection.
Global impact
Gastric cancer remains one of the leading causes of cancer-related deaths worldwide. The findings suggest that maintaining good oral hygiene, regular dental check-ups, and preventing gum disease may play a crucial role in reducing gastric cancer risk.
The study underscores the growing evidence that oral health is closely connected to systemic health and should be prioritized as part of cancer prevention strategies.
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