I don't have a PhD in genetics either but that's not quite what I meant. It's possible that, for example, that the prevalence of genetic polymorphisms that are associated with breast cancer occur at different rates in different ethnic groups. At least some polymorphic genes are related to hormone function, and abortion alters hormone function relative to giving birth. So it's conceivable there could be a difference. Having said that, I wouldn't claim that this issue means the study is meaningless, and my reading of the research is that there is no link between abortion and breast cancer - my talk page has a list of studies that have found no link. [[User:Murray|Murray]] 11:04, 25 April 2007 (EDT)