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Fertility doctors are doubling the pregnancy rate for childless women using a 'kinder' form of treatment.

The technique - In Vitro Maturation or IVM - does not need high doses of fertility drugs, dramatically cutting the risk of potentially fatal side effects.

It especially benefits women with polycystic ovary syndrome who face more risks from IVF.

IVM involves removing eggs from the mother's ovaries at an early stage in their development and maturing them in the laboratory. They are then fertilised with the father's sperm before being put back in the womb.

New results from the private Oxford Fertility Unit, which is the only unit allowed to provide IVM in Britain, show pregnancy rates as high as 48 per cent - double the normal IVF rate of 25 per cent.

The findings were announced yesterday at the American Society for Reproductive Medicine meeting in San Francisco. The clinic announced a pregnancy rate of 35 per cent for its first 40 cases, and 48 per cent for women under 35.

Conventional IVF uses injections of powerful ovary-stimulating drugs to mature the...