Breastfeeding Cuts Breast Cancer Risk
Study Shows Protective Effect Even in Women Who Delay Childbirth
April 17, 2007 (Los Angeles) -- Breastfeeding can offset the increased risk
of breast cancer faced by women who have their first baby after they turn 25,
new research suggests.
"Breastfeeding offers protection against breast cancer for all women,
even those who have their first full-term pregnancy later in life," says
Giske Ursin, MD, PhD, associate professor of preventive medicine at the Keck
School of Medicine of the University of Southern California in Los Angeles.
Ursin notes that the findings come at a time when more women are choosing to
delay childbirth until their late 20s, their 30s, and beyond.
The findings were presented at the annual meeting of the American
Association for Cancer Research.
Breastfeeding Protects Against Both Types of Breast Cancer
Previous research has shown that women who have their first baby after age
25 or who have fewer than four children are at increased risk for breast
cancer, Ursin says.
But those studies also showed that having your first baby before that age --
or having more children -- protected against breast cancers that are fueled by
hormones. This did not, however, ward off the rarer, harder-to-treat tumors
that are not fueled by hormones, Ursin tells WebMD.
The new study shows that women who first gave birth after age 25 were about
twice as likely to have either type of breast cancer as women who never gave
Breastfeeding protected against both types of breast tumors regardless of
when a woman first gave birth, Ursin says.
That is noteworthy because having a lot of babies was protective only among
women who began having children at an early age, results showed.
Furthermore, having a lot of babies only reduced the risk of
hormone-positive cancers in women who breastfed, but not in those who never
breastfed, she says.
The researchers studied 995 women with breast cancer, about three-quarters
of whom had hormone-fueled tumors, and 1,498 healthy women. The women -- all
participants in a study of breast cancer in white and black women -- were aged
55 or older.
Breastfeeding Helps Babies, Too
Timothy Rebbeck, PhD, a cancer researcher at the University of Pennsylvania
Abramson Cancer Center in Philadelphia, notes that breastfeeding is already
recommended for the sake of the baby's health. Studies show breastfed
babies are less likely to develop infections, asthma, and a host of other
diseases than their bottle-fed counterparts.
The new study suggests moms can improve their own health by breastfeeding as
well, he tells WebMD.