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Incident cancer risk after the start of aspirin use: results from a Dutch population-based cohort study of low dose aspirin users

Observational and intervention studies suggest that low dose aspirin use may prevent cancer. The objective of this study was to investigate the protective effect of long term low dose aspirin use (6 years aspirin use compared to <2 years: 1.17, 95% CI 1.02-1.34). After adjusting for current and past aspirin use, 2-6 years of low dose aspirin use was associated with a reduced colorectal cancer risk compared to <2 years of aspirin use (adjusted HR 0.75, 95% CI 0.59-0.96). However, a clear dose-response relationship was not observed (adjusted HR >6 years aspirin use 0.95, 95% CI 0.60-1.49). Our results do not support the primary prevention of cancer among long term aspirin users.

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