Late risks of breast cancer RT are higher for smokers

Numbers of heart disease events were sufficient to establish a linear relationship, according to Dr. Taylor. Numbers of lung cancers were not, but case-control studies in the literature with adequate numbers have identified a linear relationship there, too. “We use what we can, and we have got now several hundred events, if you combine all of the literature together. And they do suggest the dose-response relationship is linear, but we can’t know that for certain,” she said.