Fetal cell 'transplant' could be a hidden link between childbirth and reduced risk of breast cancer

Some benefits of motherhood are intangible, but one has been validated through biostatistical research: women who bear children have a reduced risk of developing breast cancer. In Seattle, researchers at the University of Washington and Fred Hutchinson Cancer Research Center believe they have identified a source of this protective effect: fetal cells "transplanted" to the mother before birth.

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