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PETBioNewsNewsNo overall increase in cancer risk following IVF treatment, study finds

BioNews

No overall increase in cancer risk following IVF treatment, study finds

Published 26 September 2012 posted in News and appears in BioNews 587

Author

Rosemary Paxman

Image by Alan Handyside via the Wellcome Collection. Depicts a human egg soon after fertilisation, with the two parental pronuclei clearly visible.
CC0 1.0
Image by Alan Handyside via the Wellcome Collection. Depicts a human egg soon after fertilisation, with the two parental pronuclei clearly visible.

A new study has shown that IVF may not be linked to an increased risk of certain cancers among female patients. A team of Swedish researchers concluded that although cancer or cancer treatment may increase the need for IVF, the risks of cancer post-IVF treatment were low...

A new study has shown that IVF may not be linked to an increased risk of certain cancers among female patients. A team of Swedish researchers concluded that, although cancer or cancer treatment may increase the need for IVF, the risks of cancer post-IVF treatment were low.

The study compared cancer rates in 24,000 women in Sweden who gave birth post-IVF between 1982 and 2006 with rates in 1.4 million women in the general Swedish population (who also gave birth in the same period). The researchers found that the overall risk of a woman developing cancer after IVF was roughly 25 percent lower than in women who had not undergone the procedure.

'The risk for two common cancers, breast and cervical, was significantly lower than expected', said study leader Dr Bengt Kallen of the University of Lund, Sweden. Dr Kallen explained this could be due to the better state of health necessary in women to be selected for IVF treatment. Furthermore, women needing IVF may undergo more mammography and cervical smears, aiding early detection and treatment of precancerous conditions.

'A couple who needs IVF does not have to be afraid that the hormone treatment used - at least those used in Sweden - will carry a risk for the woman to develop cancer', said Dr Kallen speaking to Reuters Health. Previous studies have suggested some hormone drugs used in IVF may be linked to cancer but these have not been numerous and have mostly been small scale, said the authors of the new study.

Different results were observed regarding ovarian cancer. The 24,000 women in the IVF patient group had a four-fold higher risk of ovarian cancer compared to the general population before treatment. After treatment, their risk fell to more than double the general population. Dr Kallen suggested this relationship could be explained by abnormalities in ovarian function, which both increase the risk of infertility (and therefore the need for IVF) and the risk for cancer. 

The findings were based on data obtained from IVF clinics in Sweden and the Swedish Cancer Registry. They were published in the journal Human Reproduction.

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