Antibiotics link to colorectal cancer: study

'Less diversity of bacterial species' from antibiotic use could be behind the increased risk

People who frequently use antibiotics are more likely than those who don't to develop colorectal cancer, a study suggests.

Overall, people who had total antibiotic usage of six months or more were more likely to develop colorectal cancer (odds ratio 1.17) than those who had no antibiotic use, the study team reported in the Journal of the National Cancer Institute.

However, when researchers excluded any antibiotic usage within two years of a cancer diagnosis, the association was no longer statistically significant.