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Scientists Studied 1,300 Cancer Patients, Then Found a Pattern in the Gut - Newsweek (opens in a new tab)

newsweek.com · 2026-09-24

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Claim 1 of 7Not checkedAfter studying stool samples from more than 1,300 cancer patients, scientists uncovered distinct gut microbiome patterns tied to different cancers.View evidenceHide evidence

As statedmore than 1,300 cancer patients

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Claim 2 of 7Not checkedResearchers from Mayo Clinic analyzed samples from 1,364 cancer patients across a range of cancer types, stages and treatments as part of the Mayo Clinic Cancer Microbiome Cohort study, published in Cell.View evidenceHide evidence

As stated1,364 cancer patients

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Claim 3 of 7Not checkedScientists found unique microbiome signatures associated with five major cancer groups, while also identifying notable differences in patients diagnosed at younger ages.View evidenceHide evidence

As statedfive major cancer groups

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Claim 4 of 7Not checkedPatients aged 50 and under with colorectal cancer had higher levels of lactate and greater amounts of Veillonella parvula, while younger breast cancer patients showed changes across 64 bacterial species and lower levels of primary bile acids.View evidenceHide evidence

As stated50 and under; 64 bacterial species

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Claim 5 of 7Not checkedThe findings do not yet explain why breast and colorectal cancers are becoming more common among younger adults, but they may provide biomarkers and mechanistic leads to test in independent clinical cohorts and preclinical models.View evidenceHide evidence

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Claim 6 of 7Not checkedThe study suggested the microbiome could help predict which patients are more likely to experience treatment side effects, especially diarrhea among patients receiving 5-fluorouracil, but not among patients receiving carboplatin.View evidenceHide evidence

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Claim 7 of 7Not checkedResearchers additionally identified gut bacteria associated with survival outcomes in colorectal, liver and intrahepatic bile duct, ovarian and prostate cancers, as well as melanoma.View evidenceHide evidence

As statedfive cancer types plus melanoma

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Papers considered

The selected paper, plus nearby candidates.

Crossref, PubMed, Europe PMC · 16 candidate papers

Candidate

Stool and Blood Sampling for Early Detection of Colorectal Cancer

Early Diagnosis and Treatment of Cancer Series: Colorectal Cancer · 2011 · Crossref

Source (opens in a new tab)

And 10 more candidates considered.