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Cancer research

No Association Between Oral Antibiotic Use and Early-onset Colorectal Cancer

Strategic Insights

— 1 min read

Research conducted in a large integrated healthcare system in the United States has found no conclusive evidence of an association between oral antibiotic use in adulthood and risk of early-onset colorectal cancer (EOCRC). The study aimed to evaluate the link between prior antibiotic use and EOCRC, as the incidence of colorectal cancer has been rising in individuals under 50 years of age. The researchers conducted a nested case-control study among Kaiser Permanente Northern California patients and analyzed prescribing records to assess antibiotic exposure 1 year before diagnosis. The results showed no significant association between antibiotic use and EOCRC in unadjusted or adjusted analyses.

Key Takeaways:

  • The study was conducted among Kaiser Permanente Northern California patients, a large integrated healthcare system in the United States.
  • The research focused on the association between prior antibiotic use and early-onset colorectal cancer (EOCRC) in individuals under 50 years of age.
  • A nested case-control study was conducted, where 1359 EOCRC cases were matched to 4711 healthy controls on various factors, including birth year, sex, race and ethnicity, medical facility, and duration of pharmacy benefit.
  • Antibiotic exposure 1 year before the diagnosis/index date was assessed using prescribing records.
  • Conditional logistic regression was used to estimate odds ratios and 95% confidence intervals.
  • A sensitivity analysis was performed among those with ≥ 10 years of continuous prescribing records.
  • The study found no conclusive evidence of an association between oral antibiotic use in adulthood and risk of EOCRC.

Statistics:

  • 1359 EOCRC cases were matched to 4711 healthy controls.
  • The study analyzed prescribing records to assess antibiotic exposure 1 year before diagnosis.
  • The odds ratio for antibiotic use and EOCRC was 1.04 (95% CI, 0.94-1.26).
  • No associations were seen for cumulative number of oral antibiotic dispensations or for any prior period of antibiotic exposure.

Sources:

  • NewsRx. Data on Colon Cancer Reported by Researchers at Kaiser Permanente San Francisco Medical Center (Oral Antibiotic Use In Adulthood and Risk of Early-onset Colorectal Cancer: a Case-control Study). Cancer Weekly. July 29, 2025; p 889.
  • Oral Antibiotic Use In Adulthood and Risk of Early-onset Colorectal Cancer: a Case-control Study. Clinical Gastroenterology and Hepatology, 2025;23(8).

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