Blood pressure pills could raise cancer risk

LONDON — Some of the world's most popular blood pressure pills may slightly increase your risk of getting cancer, but doctors say it's too soon to ditch the drugs, according to new research.

In an analysis of five previous studies following about 60,000 patients, experts found a link between people taking medicines known as angiotensin-receptor blockers, or ARBs, and cancer. The drugs are taken by millions of people worldwide for conditions like high blood pressure, heart problems and diabetic kidney disease.

In the analysis, researchers found that people who took the drugs had about a 1 percent higher risk of getting cancer than people who weren't on the drugs. This included a whole range of cancers — prostate, breast and a noticable spike in lung cancer.

About 85 percent of those people were on telmisartan, sold as Micardis, made by Boehringer Ingelheim Corp. There was no difference in the rate of cancer deaths in people on the drugs compared to those not on them.

The study was published Monday in the medical journal, Lancet Oncology. No funding was provided for the study, but Dr. Ilke Sipahi, the study's lead author, has received past payments from drug makers Pfizer Inc., AstraZeneca PLC and Ranbaxy Pharmaceuticals Inc., which all make blood pressure drugs. Other authors reported similar grants from other pharmaceuticals.

"The risk for the individual patient is modest," said Sipahi, associate director of heart failure and transplantation at University Hospitals Case Medical Center in Cleveland. "However, when you look at it from the population level, millions and millions of people are on these drugs and it can cause a lot of excess cancer worldwide."

Sipahi and colleagues calculated that one extra cancer case will occur for every 105 people taking the medications for about four years. He said there wasn't enough information to know if this increased cancer risk disappears once people stop taking the medications.

The maker of the most-used drug in the study, Boehringer Ingelheim, disputed the findings and said Micardis is one of the best-researched drugs worldwide. The company claimed in a statement that it had "internal safety data" contradicting the Lancet study. According to studies run by the pharmaceutical, there was no link between increased cancer risk and Micardis.

Sipahi warned patients not to stop taking their drugs, and recommended they consult their doctor if they were concerned.