text:  Well, I think this is an area of research that needs to be done. As we've said, it's not easy to figure out what the causation mechanism is for these chemicals and cancer. And most of the data that we have from large human studies, large epidemiological studies, don't give us a lot of evidence that there is a large effect, a major effect of these chemicals. That's not to say there isn't an effect there. It's just hard for us to detect it in human studies.