I think it would the same as those "studies" that said hairdye gave you cancer....
maybe it increases your risk by like 0.000000001% but very few things are linked DIRECTLY to cancer (smoking, excessive sun exposure, etc) because the nature of cancer is that many factors are needed for it to happen. You could smoke all your life, and sit in the sun and bake and never get cancer, but then there are the ppl who religiously wear sunscreen and never smoke but then die from cancer....