Does metformin cause cancer in bladder?

while it may not be a known side effect, my mother in law took it and we just buried her from bladder cancer.

My dad never smoked but he did take metformin for years (still is) and was just diagnosed with bladder cancer a couple months ago.

Whether bladder cancer is a "Listed" side effect or not is not the issue. The issue is that many people are getting bladder cancer from the use of Metformin. I used Metformin for a few years for diabetes and fortunately discovered stage 1 bladder cancer accidentally when passing a kidney stone in April of 2012. The use of Metformin and the link to bladder cancer NEEDS to be investigated.

we just buried my mother, she suffered from Transitional Cell Carcinoma of the bladder and kidneys, does metformin cause this type of cancer??? She was on it for years for type 2 diabetes

I was diagnosed about 4 years ago with Bladder cancer and have had about 3 operations since then. Still have my bladder but I am still being treated for it. I took Metformin for several years and am wondering just how many people like me ended up with bladder cancer.