Rising Early-Onset Gastric Cancer Rates Linked to Smoking and High-Salt Diets
Gastric cancer, also known as stomach cancer, remains a significant global health challenge, ranking as the fifth leading cause of cancer-related deaths worldwide. While overall incidence rates have been declining, a concerning trend of early-onset gastric cancer (EOGC) – diagnosed before age 50 – is emerging, exhibiting unique characteristics and a poorer prognosis. New research highlights the critical roles of lifestyle factors, particularly smoking and high-salt diets, in driving this increase.
Global Burden of Early-Onset Gastric Cancer
A comprehensive global analysis of EOGC from 1990 to 2021, published in Cancer Biology & Medicine, reveals that despite a 2.9% annual decline in global mortality, inequalities between high- and low-income regions are widening. The study, utilizing data from the Global Burden of Disease (GBD) 2021, found approximately 125,000 new EOGC cases, 78,000 deaths, and 3.86 million disability-adjusted life years (DALYs) worldwide in 2021.
The incidence of EOGC peaks in individuals aged 45-49, with males exhibiting higher prevalence. However, females under 30 experience a greater risk of mortality. While age-standardized incidence and mortality rates have generally decreased globally, particularly in East Asia and Europe, several sub-Saharan African countries are experiencing rising rates.
Key Risk Factors: Smoking and High-Salt Diets
The research identified smoking and high-salt diets as major contributors to the burden of EOGC, accounting for 7.1% and 7.7% of DALYs, respectively. Smoking accounts for over 10% of DALYs in East Asia and Central Europe, while high-salt diets consistently impact disease burden globally. Current smoking is associated with a 33% increased risk of developing gastric cancer compared to never smokers. Smoking introduces carcinogens that damage stomach lining cells and worsen the effects of Helicobacter pylori infection, further increasing cancer risk.
Disparities and Future Directions
Significant disparities exist between high- and low-income regions. High-income countries have seen steady reductions in EOGC rates through screening and health education initiatives. In contrast, low-income regions face growing burdens due to limited healthcare access and population growth.
Researchers project a continued global decline in EOGC through 2040. However, effective prevention requires tailored strategies. In high-risk regions like East Asia, promoting dietary interventions and early endoscopic screening is crucial. Low-income areas need investment in healthcare infrastructure and public awareness programs. Tobacco taxation, food labeling, and salt reduction campaigns can further reduce exposure to key risk factors.
Future research combining epidemiological data with genomic and environmental monitoring will help identify susceptible populations and optimize precision prevention strategies against EOGC.
Expert Perspective
“EOGC poses a complex challenge due to the fact that it affects individuals during their most productive years,” says Wei Wang, corresponding author from Chongqing Medical University. “Our findings show that preventive measures such as smoking control, salt reduction, and H. Pylori eradication can significantly lower the disease burden. However, these strategies must be tailored to local conditions. In low-resource settings, strengthening healthcare infrastructure and expanding screening access are critical steps toward reducing disparities.”
The study underscores the importance of integrating lifestyle modification, early detection, and public health policy to address EOGC globally.