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Women who give birth to multiple babies after IVF are at higher risk of breast cancer
Date:7/9/2013

London -- Women who give birth to multiple babies following IVF treatment are at a higher risk of breast cancer than those giving birth to singletons or who remain childless. Dutch investigators from the Omega study group said the explanation may not be the multiple pregnancy per se but a maternal trait related to a higher implantation potential and to breast cancer itself.

Although the results were derived from a large nationwide cohort study, the investigators emphasise that the findings should next be replicated in further studies and that presently there is no reason for earlier breast cancer screening than is recommended for the general population.(1)

The study, presented today at the annual meeting of ESHRE by Dr Els Groeneveld from the VU University Medical Centre of Amsterdam, the Netherlands, analysed data from the Omega study, a large Dutch nationwide cohort of 19,861 women who received IVF or ICSI treatment between 1983 and 1995. Between 1997 and 1999 all patients were questioned (by questionnaire) about their treatment and its outcome. Those who completed the questionnaire (12,589 women) were cross-referred to the Netherlands Cancer Registry.

Cohort analysis showed that over a median 16.7 years of follow-up 1688 women in the study gave birth to multiples (13%), 6027 delivered singletons (48%), and 4874 remained childless (39%). Among these women there were 317 confirmed diagnoses of breast cancer, of whom 57 gave birth to multiples, 155 to singletons, and 105 remained childless. When these findings were analysed statistically, results showed that mothers of multiples had a (44%) higher breast cancer risk than the mothers of singletons (hazard ratio 1.44, statistically significant) when adjusted for year of IVF treatment, number of IVF cycles, height and age at first birth. Nulliparous women were at no increased risk of breast cancer.

Remarkably, only multiple pregnancies conceived after the complete implantati
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Contact: Christine Bauquis
Christine@eshre.eu
32-499-258-046
European Society of Human Reproduction and Embryology
Source:Eurekalert

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