Stem cells can be obtained from unneeded embryos made during in vitro fertilisation

nobeastsofierce Science / Alamy

A kind of stem cell transplant that has long been seen as one of the most promising new kinds of medical treatments could bring a greater risk of cancer than we previously thought. A study has found that more than a fifth of stem cells being grown in laboratories for regenerative medicine research harbour cancer-causing mutations.

The cells tested haven’t been put into people, but were being used in research to explore their medical use. The findings show…

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