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Proguanil and atovaquone use is associated with lower colorectal cancer risk: a nationwide cohort study | BMC Medicine

Individuals with a family history of colorectal cancer (CRC) are at a high risk of developing CRC. Preclinical studies suggest that the anti-malaria drug proguanil and atovaquone might play a role in preventing CRC, but population-based evidence is still lacking. By accessing a couple of nationwide Swedish registers, we performed a cohort study to explore whether using proguanil and atovaquone might associate with a lower risk of CRC by adopting a new-user study design. Adults who have 1 or more first-degree relatives (parents or siblings) diagnosed with CRC were identified and linked with the Prescribed Drug Register to evaluate their administration history of proguanil and atovaquone. Survival analysis of the time to CRC diagnosis with Cox proportional hazards regression was used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs). A total of 16,817 incident proguanil/atovaquone users were identified and matched with 168,170 comparisons, who did not use proguanil/atova ....

Lund Dnr , International Classification Of Diseases , National Patient Register , Regional Ethical Review Board , Swedish Multi Generation Register , Swedish Cancer Registry , International Classification , Swedish Prescribed Drug Register , Anatomical Therapeutic Chemical Classification , Death Register , Statistics Sweden , Total Population Register , Charlson Comorbidity Index , Swedish Prescribed Drug ,