A major analysis from the Johannesburg Cancer Study has identified smoking as the most significant modifiable risk factor for esophageal squamous cell carcinoma.
The study examined 939 cases of esophageal squamous cell carcinoma against 3,089 cancer controls to pinpoint key lifestyle and environmental influences.
Current smokers faced the highest risk, with an adjusted odds ratio of 6.71, while former smokers also showed a strong association with an odds ratio of 2.82. In contrast, very high alcohol intake (at least 840g ethanol per week) was linked to a more modest odds ratio of 1.56.
These findings underscore the critical importance of smoking cessation in prevention efforts, suggesting it offers the greatest potential impact. While alcohol use is a factor, its impact appears weaker and most relevant at very high consumption levels.
The research also highlighted that risk correlates with socioeconomic disadvantage, rural origin, lower education, and the use of biomass fuels. These household environmental factors, with an odds ratio of 1.50 for fuel exposure, contribute meaningfully to risk alongside behavioral choices.
Experts suggest viewing esophageal cancer prevention through a syndemic lens, where smoking, hazardous drinking, socioeconomic factors, and environmental exposures are interconnected. Prevention strategies should encompass smoking cessation, reducing hazardous drinking, and addressing harmful household exposures, particularly in vulnerable communities.