I am sorry to hear about your loss.
Metformin has not shown to cause bladder cancer.
In fact, some studies suggested that metformin may reduce the risk of bladder cancer.
Type 2 diabetes itself poses a higher risk for bladder cancer.
Some anti diabetic medications like pioglitazone, or rosiglitazone can increase the risk of bladder cancer.
But metformin is not a problem.
Again my commiserations for you.
It was my pleasure to help you today.
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