Moderate to heavy drinking linked to increased risk of early-onset colorectal cancer

By gathering data from 5,666,576 individuals aged 20-49 years using information from the Korean National Health Insurance Service (2009-2019), alcohol consumption levels of nondrinker, light (reference), moderate, and heavy drinkers were calculated. Consumption levels were calculated as light, moderate and heavy based on ethanol consumption (grams per day) defined as 0, <10, 10 to <30, and ≥30 g/d for men and 0, <10, 10 to <20, and ≥20 g/d for women, respectively. Multivariate Cox proportional hazards models were used to estimate adjusted hazard ratios (aHRs) with 95% CIs. 

Results: 

• Nearly 8,314 incident early-onset CRC cases were identified during the follow-up period.
• Moderate and heavy drinkers showed an increased risk of early-onset CRC compared with light drinkers.
• Subgroup analysis by tumor location showed positive dose-response significance for early-onset distal colon and rectal cancers, but not for proximal colon cancer.
• The dose-response association between drinking frequency and risk of early-onset CRC was significant with a 7%, 14%, and 27% increased risk for 1-2, 3-4, and ≥5 d/wk compared with nondrinkers, respectively

Thus, this nationwide population-based study is the first of its kind to show that graded increasing amounts and increased frequency of alcohol consumption were associated with an increased onset of early-onset colorectal cancer. 

Further reading: Sex and Tumor-Site Differences in the Association of Alcohol Intake With the Risk of Early-Onset Colorectal Cancer. DOI: 10.1200/JCO.22.01895 Journal of Clinical Oncology 41, no. 22 (August 01, 2023) 3816-3825.