Nine women in Sweden have successfully received transplanted wombs donated from relatives and will soon try to become pregnant, the doctor in charge of the pioneering project has revealed.

The women were born without a uterus or had it removed because of cervical cancer. Most are in their 30s and are part of the first major experiment to test whether it is possible to transplant wombs into women so they can give birth to their own children.

Life-saving transplants of organs such as hearts, livers and kidneys have been done for decades and doctors are increasingly transplanting hands, faces and other body parts to improve patients’ quality of life. Womb transplants – the first ones intended to be temporary, just to allow childbearing – push that frontier even further and raise some new concerns.

There have been two previous attempts to transplant a womb – in Turkey and Saudi Arabia – but both failed to produce babies. Scientists in Britain, Hungary and elsewhere are also planning similar operations but the efforts in Sweden are the most advanced.

“This is a new kind of surgery,” Dr Mats Brannstrom told the Associated Press in an interview from Gothenburg. “We have no textbook to look at.”

Dr Brannstrom, chair of the obstetrics and gynecology department at the University of Gothenburg, is leading the initiative. Next month, he and colleagues will run the first-ever workshop on how to perform womb transplants and they plan to publish a scientific report on their efforts soon.

He said the nine womb recipients were doing well. Many already had their periods six weeks after the transplants, an early sign that the wombs are healthy and functioning. One woman had an infection in her newly received uterus and others had some minor rejection episodes, but none of the recipients or donors needed intensive care after the surgery, Dr Brannstrom said. All left the hospital within days.

None of the women who donated or received wombs have been identified. The transplants began in September 2012 and the donors include mothers and other female relatives of the recipients. The team had initially planned to do 10 transplants, but one woman could not proceed due to medical reasons, university spokesman Krister Svahn said.

The transplant operations did not connect any of the women’s uteruses to their fallopian tubes, so they are unable to get pregnant naturally. But all who received a womb have their own ovaries and can make eggs. Before the operation, they had some removed to create embryos through in-vitro fertilisation. The embryos were then frozen and doctors plan to transfer them into the new wombs, allowing the women to carry their own biological children.

The transplants have ignited hope among women unable to have children because they lost a uterus to cancer or were born without one. About one in 4,500 girls are born with a syndrome, known as MRKH, where they do not have a womb.

Fertility experts have hailed the project as significant but stress it is not known whether the transplants will result in healthy babies.

The technique used in Sweden, using live donors, is somewhat controversial. In Britain, doctors are also planning to perform uterus transplants, but will only use wombs from dying or dead people. That was also the case in Turkey. Last year, Turkish doctors announced their patient got pregnant but the pregnancy failed after two months.

“Mats has done something amazing and we understand completely why he has taken this route, but we are wary of that approach,” said Dr Richard Smith, head of the UK charity Womb Transplant UK, which is trying to raise £500,000 to carry out five operations in Britain.

He said a womb transplant is like a radical hysterectomy but it requires taking a bigger chunk of the surrounding blood vessels to ensure adequate blood flow, raising the risk of complications for the donor. Dr Smith said British officials do not consider it ethical to let donors take such chances for an operation that is not considered life-saving.

He said the biggest question is how any pregnancies will proceed.

“The principal concern for me is if the baby will get enough nourishment from the placenta and if the blood flow is good enough,” he said.

All of the women who received womb transplants will need to take anti-rejection medicines, but Dr Smith said data from women who have received kidney transplants does not suggest their babies are at any increased risk from the drugs.

Dr Brannstrom said using live donors allowed them to ensure the donated wombs were functional and did not have any problems like an HPV infection.

Doctors in Saudi Arabia performed the first womb transplant in 2000, using a live donor, but that uterus had to be removed after three months because of a blood clot.

Dr Brannstrom said he and his colleagues hope to start transferring embryos into some of their patients soon, possibly within months. The Swedish researchers and others have previously reported successful uterus transplants in animals including mice, sheep and baboons, but no offspring from the primates were produced.

After a maximum of two pregnancies, the wombs will be removed so the women can stop taking the anti-rejection drugs, which can cause high blood pressure, swelling and diabetes and may also raise the risk of some types of cancer.

Other experts said if the operations are successful, womb transplants could be an alternative for women who have few choices.

“What remains to be seen is whether this is a viable option or if this is going to be confined to research and limited experimentation,” said Dr Yacoub Khalaf, director of the Assisted Conception unit at Guy’s and St. Thomas’ Hospital in London, who was unconnected to any of the womb transplant projects.

Lise Gime, 35, who was born without a womb, said she thought many women with MRKH syndrome would be interested if the operation proves to be safe and effective.

Ms Gime runs an organisation for women with the syndrome in Norway.

“If this had been possible when I was younger, no doubt I would have been interested,” she said.

Ms Gime, who has two foster children, said the only option for women like her to have biological children is via surrogacy, which is illegal in many European countries, including Norway and Sweden.

Dr Brannstrom warned that the transplants might not result in children but remained optimistic.

“This is a research study,” he said. “It could lead to (the women) having a child, but there are no guarantees... what is certain is that they are making a contribution to science.”