"This two-fold increased risk went away when we looked only at women who breast-fed, " Ursin says.
NPR: Study: Breast-Feeding Decreases Cancer Risk
This made Dr. Geske Ursin and her colleagues wonder whether the hormonal changes associated with pregnancy and breast-feeding were somehow the reason.
And earlier this week, Ursin reported further good news at a meeting of the American Association for Cancer Research in Los Angeles.
Ursin says that could mean more breast cancers for them later on.
"We had looked at giving birth early, giving birth late, as well as breast-feeding, " says Ursin, who's on the faculty at the University of Southern California.
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