In a reassuring new
finding, there appears to be no extra cancer risk among children born after
More than 5 million
children worldwide have been born through in vitro fertilization (IVF).
However, concerns that the manipulation of sperm and egg might make these
children more prone to cancer prompted the British researchers to investigate.
However, the risk to
IVF-conceived children was found to be "the same as naturally conceived
children," said lead researcher Dr Alastair Sutcliffe, a specialist in
general paediatrics at the University College London. "This is a promising
sign for their future health as they grow into adult life," he said.
"[This study, which
is] bigger than all the existing studies, has a powerful and reassuring message
to families, fertility specialists and the public," Sutcliffe added.
"Namely that in a near 100% coverage of 106 000 children conceived
with IVF, the rate of childhood cancer was almost identical to that of the
naturally conceived children over the same time frame."
Although the overall risk
of cancer did not rise for these children, the incidence of two less common
types of cancer was higher than expected.
A US expert was pleased
with the findings, which were published in the New England Journal of
"This study is
extremely reassuring and should relieve anybody's anxiety about IVF," said
Dr Lawrence Grunfeld, an associate clinical professor of obstetrics, gynaecology
and reproductive science at the Mount Sinai Icahn School of Medicine, in New
Studies have found that
most medical problems of children conceived through IVF are not a result of the
procedure, but can be traced to a genetic risk for a disease or the underlying
problem that caused the parent's infertility in the first place, Grunfeld said.
For the study, Sutcliffe's
team collected data on more than 106 000 children born through assisted
reproduction between 1992 and 2008. They then compared the number of those
children who had cancer with the expected number of cancers among children in
the general population before age 15.
Small increased risk
During an average of nearly
seven years of follow-up, the researchers identified 108 cancers in the
children, compared with the approximately 110 expected.
Among children conceived through
IVF, there was no increased risk of leukaemia, neuroblastoma (cancer of nerve
tissues), retinoblastoma (cancer of the eyes), central nervous system tumours,
kidney cancer or the group of cancers referred to as germ-cell tumours.
There was, however, a small
increased risk of two relatively rare cancers. The first was hepatoblastoma, a
cancer of the liver, and rhabdomyosarcoma, a cancer of tissue that connects
bones. Of the more than 106 000 children born after IVF, six developed
hepatoblastoma and 10 rhabdomyosarcoma, the researchers found.
Dr Tomer Singer, an
obstetrician and gynaecologist at Lenox Hill Hospital in New York City, said
both of these rare cancers have very good cure and survival rates.
"This study gives you
reassuring data that this technology is safe," Singer said.
To learn more about IVF,
visit the US National Library of Medicine.
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