Record ID: MS-N082 · Family: Nutrition and dietary patterns / survivorship · Clinical question: Is coffee consumption during and after adjuvant chemotherapy associated with recurrence or survival in stage III colon cancer?
Evidence label: Favorable prospective observational association; coffee was not randomized and the result is not a recommendation to start high intake.
Evidence at a glance
- Benefit: Four or more cups daily was associated with lower recurrence-or-death risk than no coffee.
- Certainty: Low for causality.
- Risk: Insomnia, anxiety, palpitations, reflux, diarrhea and drug-specific concerns; high intake may be poorly tolerated.
- Cancer control: Association only; coffee has not been shown to treat colon cancer.
What was studied
Within CALGB 89803, 953 people with stage III colon cancer reported caffeinated coffee, decaffeinated coffee, tea and other dietary intake during and six months after adjuvant chemotherapy. Coffee exposure was observational, not assigned.
What the results show
Compared with non-drinkers, people reporting at least four cups/day of total coffee had an adjusted HR of 0.58 (95% CI 0.34–0.99) for recurrence or death. For caffeinated coffee, the corresponding HR was 0.48 (95% CI 0.25–0.91). Across extreme quintiles of caffeine intake, the HR was 0.66 (95% CI 0.47–0.93).
Decaffeinated coffee and nonherbal tea did not show the same clear association. This pattern is hypothesis-generating; it does not prove caffeine or coffee caused improved outcomes.
Important limits
- Coffee was self-selected and measured by questionnaire.
- People able to tolerate high coffee intake may differ in health and behavior from abstainers.
- Cup size, preparation, additives and intake changes over time introduce measurement error.
- This is the same CALGB cohort used for other diet analyses, not another independent trial.
- The findings do not establish safety or benefit during every treatment regimen.
Safety and practical context
Do not escalate coffee intake to chase an observational hazard ratio. Review caffeine if there is insomnia, anxiety, arrhythmia, reflux, diarrhea, dehydration concern or a medication-specific interaction.
Questions for the care team
- Is coffee safe with my medicines, heart rhythm, sleep and bowel symptoms?
- What did “one cup” mean in the study compared with my usual drink?
- Am I considering coffee for enjoyment or as an unproven cancer-control strategy?
- Would reducing sugar or cream matter more for my overall nutrition goal?
Sources checked
Funding and conflicts: Supported through the National Cancer Institute cooperative-group program; the original article contains full grant and author-disclosure information.
Last literature search: October 20, 2026 · Record appraisal: October 20, 2026
Educational information only. This record is not a prescription and does not replace advice from the oncology team, registered dietitian or oncology pharmacist.
