This is a first I have heard of this one! My advice is they say you can get cancer from anything. You can't live your life worrying about the things you can't prevent. Worry about the diseases you can prevent. ;0)
No.Absolutely not.Underwires have been in bras since the Victorian era,when they used to be made of whalebone.Now they are metal.I usually make two pinholes on the ends and just pull them right out of the bra.Usually, a bra that is meant to hold them has extra support just by its structure and doesnt need them.But Im 52 years old and have never suffered any health problems from having worn underwires.And I wore them a lot when I was young.