The FDA is reviewing the results of a study that may link bladder cancer with the diabetes drug Actos:

The agency said Friday that five-year results from an ongoing study show that patients who have taken Actos for the longest period of time had a higher risk of bladder cancer. Bladder cancer was also more prevalent in patients who had taken the largest cumulative dose of the drug.

Source: FDA reviewing cancer risk with diabetes pill Actos

Of course, just because people who took Actos developed bladder cancer that doesn’t mean that Actos caused bladder cancer.  Still, the fact that those who took the largest doses of the drug developed bladder cancer is a strong sign that there may in fact be a link. 

UPDATE: I am now accepting cases from individuals who developed bladder cancer while taking Actos.  More information on Actos lawsuits here.