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A landmark in the development of fertility treatment was announced by doctors yesterday with the birth of the first babies to be conceived using a revolutionary technique that offers a safer, cheaper alternative to IVF.
The twin boy and girl, who were born on October 18 at the
Radcliffe Infirmary in Oxford, were conceived using in vitro maturation (IVM), which dispenses with the use of costly fertility drugs, saving up to £1500 ($4000) on the normal price of treatment.
The technique is also safer for the one in three women among those seeking fertility treatment who have polycystic ovaries, a condition that puts them at high risk of dangerous side-effects from fertility drugs.
Specialists said the development could make in vitro techniques available to more infertile couples by cutting treatment costs.
Infertility is estimated to affect one in six couples in Britain but IVF costs around £5000 a cycle and treatment is restricted on the NHS.
Tim Child, a consultant gynaecologist at the Oxford Fertility Clinic and senior fellow in reproductive medicine at Oxford University, who led the work, said: "I think it is a safer, cheaper alternative to IVF for all women. However, for many women the success rates are currently much lower. Research in the future will address this."
The Oxford Fertility Clinic is the only one in Britain licensed to use the technique: 20 cycles of treatment have been carried out and four other women are pregnant, giving a pregnancy rate of 25 per cent. This is expected to improve with further experience. As well, without the need for drugs, repeating the procedure would be less taxing on the woman. For standard IVF, the Oxford clinic's pregnancy rate is 45 per cent.
The parents of the babies, who have asked to remain anonymous, were delighted, Mr Child said. At birth the boy, born first, weighed 3kg and the girl weighed 2.6kg. "The parents are ecstatic. They have got absolutely stunning twins. They went home on Tuesday to start their new life together. It is wonderful."
In standard IVF, the woman takes fertility drugs for five weeks to stimulate production of her eggs, which are then collected direct from her ovaries under the guidance of ultrasound, before being fertilised in the laboratory. The drugs cost between £600 and £1500, with charges often higher in London.
The procedure is time-consuming and uncomfortable and for the third of women with polycystic ovaries there is a one in 10 risk of severe ovarian hyperstimulation syndrome, a dangerous side-effect that in rare cases can prove fatal.
IVM avoids the use of drugs and instead involves collecting eggs from the ovaries while they are still immature. The eggs are then grown in the laboratory for 24 to 48 hours before being fertilised and replaced in the womb.
Mr Child said: "The main advantage is improved safety for women. Women with polycystic ovaries have a one in 10 chance of severe ovarian hyperstimulation syndrome. IVM completely takes away that risk. IVF is also expensive. With IVM the cost is reduced."
The technique was pioneered by the University of McGill in Montreal, Canada, where Mr Child spent two years researching and developing it before joining Oxford University in 2004. It has also been used in Seoul, South Korea, and Scandinavia. About 400 babies have been born worldwide using IVM compared with around two million by IVF.
At present the Oxford Fertility Clinic is offering the treatment only to women with polycystic ovaries, but in the long term Mr Child said he hoped to offer the procedure to all women.
"When we see patients we say these are the options and it is up to them to decide. We are not offering it to women with normal ovaries at present because we don't get enough eggs from them. It depends on the number of resting follicles and with normal ovaries you don't get so many.
"On average we get four eggs from a woman with normal ovaries compared with 16 from one with polycystic ovaries. The procedure involves a process of attrition - two-thirds mature and two-thirds of those fertilise - so you need a decent number to start with."
Research on developing the culture medium in which the eggs are matured in the laboratory could reduce the attrition rate so that fewer eggs are needed.
The technique could then become suitable for women with normal ovaries.
A second drawback of the procedure was that eggs grown in culture had a harder outer shell than those matured in the ovary and were more difficult for sperm to penetrate.
The eggs had to be fertilised by ICSI - injecting a single sperm directly into the egg.
A spokesman for the Human Fertilisation and Embryology Authority said IVF was expensive for most couples and a minority got treatment on the NHS. But it was too soon to tell whether IVM would replace IVF.
"This is an emerging technology - it is very early days. The most important thing is that patients get proper information so they can make a decision on what is best for themselves."
- Independent
