Date:7/1/2009

significant evidence that it does, in fact, increase live birth rates after IVF. Our findings have shown that almost every cell of a human embryo carries a different genetic composition; consequently, the one cell that is analysed genetically is not representative of the rest of the embryo. If the tested cell is genetically abnormal, the embryo will not be transferred. But the rest of the embryo might be normal and develop into a healthy person. Therefore, the use of PGS means that potentially viable embryos will be discarded. The prevalent chromosomal instability in all early human IVF embryos explains the failure of PGS to improve the live birth rate per embryo transferred.

"I think that we have made a crucial breakthrough that will change the way we do preimplantation genetic diagnosis and PGS and help to advance our ability to improve human fertility," said Ms Vanneste.

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Contact: Mary Rice mary@mrcommunication.org European Society for Human Reproduction and Embryology Source:Eurekalert

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