Bladder Cancer: January 2007 Archives

Drinking, or even immersing yourself in, chlorinated water may increase your risk of bladder cancer, says a new study.

The new study is the first to suggest that chlorine is harmful to humans when ingested or absorbed through the skin, according to study leader Cristina M. Villanueva of the Municipal Institute of Medical Research in Barcelona and her colleagues.

Chlorine itself is not harmful, but its byproducts increase the risk of cancer. Trihalomethanes are the most prevalent by-product, and they can be absorbed into the body through the skin or by inhalation. When THM is absorbed through the skin or into the lungs, they hold stronger carcinogenic properties because they aren’t detoxified through the liver, Villanueva and her team found in their research.

Gonorrhea, a common sexually transmitted infection, can double the risk of bladder cancer in men, researchers said on Tuesday.

Earlier studies had already suggested a link and scientists from the Harvard School of Public Health in Massachusetts who monitored the health of 51,529 American men found 286 cases of bladder cancer in men who had had the infection.

"We observed a two-fold increase in bladder cancer risk among men with a history of Gonorrhea," said Dr Dominique Michaud, the lead author of the research reported in the British Journal of Cancer.

The link was stronger for invasive and advanced bladder cancer, which is more serious and difficult to treat, and among smokers.