Swedish doctors claim pioneering uterus transplant

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"The group of patients that would need this is so small we decided to focus our efforts elsewhere," he said. "We started in rats, but once we got to humans, it became very clear the rejection drug was going to be the issue, and we didn’t know how to safely deal with that issue."

In Sweden, Olausson said anti-rejection drugs have not proved harmful to fetuses when the mother has undergone other organ transplants. Also, tests on mice, rats and pigs with transplanted wombs showed no ill effects from such drugs, he said.

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