'Nut allergy cure would change my daughter's life'

"I don't know whether Sofia would ever feel comfortable eating a nut," Sam said.

"However, what [a breakthrough] would mean is we can move through life with a little bit more ease. And for me, as a parent… even Sofia going to her friend's for a couple of hours, I just don't relax.

"It would be the most incredible development not only for Sofia and her lifetime, but future generations.

"It's just so reassuring to know that it's being taken so seriously."