A drug which may encourage embryos to implant in the womb has shown encouraging results in early trials - producing babies for women who had endured repeated IVF failures.
The drug, LIF, will now move to wider trials before it is offered routinely to women.
Fertility treatment is successful in fewer than half of all couples who try them, even after repeated attempts. Many of these failures cannot be properly explained, although doctors suspect that in some cases, the fertilised embryo fails to implant correctly in the wall of the womb after it is transferred back by doctors.
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