After Breast Cancer: Pregnancy OK?
Study Shows Waiting 2 Years May Not Be Necessary for Breast Cancer Survivors
Dec. 7, 2006 -- Young women with breast cancer are often advised to wait at
least two years after treatment before becoming pregnant, but waiting isn't
necessary for those with a good chance of surviving their disease, a new study
University of Western Australia researchers followed women treated for
breast cancer who waited to
conceive and women who did not.
They found that conceiving as early as six months after diagnosis did not
appear to reduce survival among women with localized disease and a good
"As long as a woman understands her prognosis, and that prognosis is
good, there is no need to wait," researcher Angela Ives tells WebMD.
"But it is very important that she discuss pregnancy with her doctor
before making the decision."
Study after study has shown pregnancy to be safe for breast cancer survivors
with a good prognosis. Some even suggest a protective benefit for conception
But the timing of pregnancy following breast cancer treatment has not been
well studied. Women are often told to wait several years before conceiving,
primarily to deter women with a poor prognosis from attempting pregnancy.
Ives and colleagues examined pregnancy timing and survival among 123 women
between the ages of 15 and 44 who had at least one pregnancy following a
diagnosis of breast cancer. The women's average age at first-postdiagnosis
pregnancy was 35.
Half of the women conceived within two years of their breast cancer
Compared with young cancer survivors who did not become pregnant, those who
conceived six months or more after being diagnosed appeared to have a slight
survival advantage. But this advantage probably doesn't mean that pregnancy has
a direct impact on survival.
Rather, the thinking is that women who are healthiest after breast cancer
treatment are more likely to attempt pregnancy than women who are sickest.
The 'healthy-mother effect' hypothesis was first proposed more than a decade
ago by researchers in Finland who found childbirth after breast cancer
treatment to be strongly linked to survival.
"I don't think that anyone believes that pregnancy, with its huge surge
in hormones, would be in any way directly protective against breast
cancer," says Eugenia Calle, PhD, of the American Cancer Society. "It
is much more likely that women who feel better are more likely to conceive or
Study 'Too Small'
Calle tells WebMD that she knows of no formal guidelines instructing breast
cancer survivors to delay pregnancy for at least two years after diagnosis or
But she adds that the Australian study was far too small to prove that
attempting pregnancy earlier than this is safe.
Just 20 of the patients in the study got pregnant within six months of
diagnosis, and these women had much poorer outcomes than women who waited
longer than six months. Forty-two patients got pregnant within seven to 24
months of diagnosis, and 61 got pregnant after two years.
"This study was just too small to answer the question that these
researchers claim to have answered," she says.