Pregnant cancer patients have been advised not to jump to conclusions after a study claimed that some chemotherapy treatment could affect the fertility of unborn baby girls.
Researchers at Edinburgh University found a drug called etoposide damaged the development of ovary tissue in mice.
But Professor Allan Pacey, from the University of Sheffield and a former chair of the British Fertility Society, told Paul Ross that it is too soon to make assumptions that the same is true for humans.
"We need to get this into context," he said. "It's actually a study on mice and what it does is show proof of principle.
"The same may be true in humans, it may not.
"We think many chemotherapy drugs don't get to the baby because the placenta is keeping them out."
Listen to the full interview to find out more