The risk is said to be slight. But there is concern because these medications are widely used.
The drugs are known as ARBs and include medicines such as Micardis, Diovan and Atacand.
The study in the Lancet oncology online journal found that patients were 1.2 percent more likely to be diagnosed with a new cancer over four years than others who did not take the drugs.
These drugs work by blocking cell receptors for a hormone that plays an important role in regulating blood pressure.
Scientists are asking for more research but say physicians should be cautious about prescribing these medications.
