Link between bladder cancer and hair dyes

First there was a study that said use of permanent hair dyes especially dark shades was associated with higher risk of bladder cancer.

Then they said there was a genetic component: only women that had a certain genetic whatnot were the ones at higher risk.

Then they said there is no connection...

So, I guess I'll see what state-of-the-art science says by the time it's time to color my hair.