Gut Toxin Linked to 70% of Young Colorectal Cancers

A specialized colon bacillus toxin has been identified as the cause of 70 percent of colorectal cancer cases among Japanese patients younger than 40. This groundbreaking discovery by University of Osaka and University of Tokyo researchers offers hope for understanding and preventing this growing health concern.

The scientific team analyzed genome mutations in colorectal cancer cells from 200 Japanese subjects. Their findings revealed that 44.8 percent of patients showed mutations linked to colibactin, a toxin known to cause genome changes in cancer-related genes. These toxin-associated mutations were particularly prevalent in younger patients.

Crucially, the colibactin-linked mutations were found in over 70 percent of individuals who developed colorectal cancer before the age of 40. The research suggests these toxin-connected mutations could begin as early as age 10, acting as a long-term trigger for cancer development. The exact infection route of the bacillus remains unknown.

The implications of this discovery are substantial, potentially leading to methods for controlling the bacillus's infection or eradicating it to prevent colorectal cancer, much like strategies used against stomach cancer. The findings were published in the journal Nature Genetics.