Is there any evidence that use of underarm deodorants/antiperspirants is linked to breast cancer?

I don't think there are any data that have shown a link. I think the concerns with some of the deodorants as well as other personal care products has been the estrogen products we mentioned earlier, but the animal data are not clear and as far as I'm aware, there are no epidemiological data to support a causal role. That's true and probably going to be true for the rest of our lives. So what do you do in the meantime? I think a prudent avoidance of suspect material is all we can say. The reality is we do not have human evidence of harm. But that should not be confused with meaning that there is no harm. It merely means that, given the tools we have available to us now, we cannot answer the questions with studies in human