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The prevention of hereditary breast and ovarian cancer by PGD is 'feasible'
Date:7/2/2012

Istanbul, 2 July 2012: Preimplantation genetic diagnosis (PGD) for the breast cancer genes BRCA1/2 is now feasible and established, with good success rates for those treated, according to investigators from the reproduction, oncology and genetics centres of the university hospitals of Maastricht and Brussels. The results follow a review of the largest number of PGD treatments for BRCA1/2 in Europe and were presented today at the annual meeting of ESHRE (European Society of Human Reproduction and Embryology) by Professor Willem Verpoest from the Centre for Reproductive Medicine at Vrije Universiteit Brussel, Belgium.

Behind his vote of confidence lie 145 PGD cycles for BRCA1/2 mutations performed in 70 couples at the two centres (a mean of 2.1 cycles per woman). Almost 60% of the mutation carriers were female, two-thirds with a BRCA1 mutation. Just over one quarter (26.2%) of female carriers had undergone a prophylactic bilateral mastectomy.

Following IVF, 717 embryos were found suitable for genetic analysis, and of these 43.1% were diagnosed as affected by the mutation, with 40.7% unaffected and thus suitable for transfer (the remainder had an abnormal genotype or the analysis was inconclusive). Hence, 62.1% of the PGD cycles led to fresh embryo transfer - with 3.6% transferred from one or two frozen-thawed unaffected embryos - resulting in 42 pregnancies in 40 women. Pregnancy rates were 41.4% per fresh embryo transfer and 23.1% per frozen. The overall pregnancy rate was 29%.

The series also included three cases of PGD on embryos previously cryopreserved for fertility preservation prior to chemotherapy, and these too resulted in two ongoing pregnancies.

Two female BRCA1 carriers were diagnosed with breast cancer within three months of the PGD treatment, despite breast screening shortly before treatment. One had a history of breast cancer, the other patient hadn't. The former patient went on to have healthy twins three years
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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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