Scientists at Johns Hopkins University have identified a long-sought mechanism linking a common gut bacterium to colorectal cancer, resolving a question that has confounded researchers for nearly two decades. According to the findings, Bacteroides fragilis produces a toxin that compromises the colon's protective lining, setting off chronic inflammation that ultimately fosters tumor formation. The discovery offers a concrete biological explanation for how a microbe found in many healthy digestive tracts can, under certain conditions, contribute to one of the most prevalent cancers worldwide.
The research carries significant public health implications, potentially informing new approaches to risk assessment, screening and prevention for colorectal cancer, which remains a leading cause of cancer-related deaths globally. Experts caution that the bacterium is widespread and does not cause cancer in all carriers, suggesting that additional genetic and environmental factors likely influence outcomes. The Johns Hopkins team's work adds to a growing body of evidence tying the gut microbiome to cancer development, though further studies will be needed to translate the findings into clinical tools. The full results were published in a peer-reviewed scientific journal.
Independent reporting synthesized from primary wires and global correspondents.