Connie Yates is due to attend a meeting of specialists which has been organised as part of the latest stage of a court fight over whether Charlie should be given experimental treatment in America.
Charlie was born in August with mitochondrial DNA depletion syndrome, a progressive disease that causes muscle weakness and loss of motor skills, leaving those who have it unable to stand, walk, eat, talk and eventually breathe. The case attracted global attention after Pope Francis and President Donald Trump weighed in.
The new High Court hearing was requested after the Vatican's children's hospital and the United States hospital said a new experimental protocol might work for Charlie, whose parents have been trying to secure a move to the US. It has prompted a fierce debate around the world about medical ethics and whether the hospital treating the child or his parents should determine his fate.
He has been given an honorary contract allowing him to see the boy and have full access to his medical records. Hirano recently put the chances of Charlie improving under new experimental treatment at between 10% and 50%. Gard's parents want to take him to the United States to give him an opportunity to undergo an experimental therapy. But GOSH says Charlie, who can not breathe without a ventilator, has no quality of life and that his life support should be turned off.
Charlie's parents, who are in their 30s and come from Bedfont, west London, have already lost battles in the High Court, Court of Appeal and Supreme Court in London.
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Hirano, who has been providing evidence to the High Court via video link, suggested that now, there is clinical data that were not available in April, and he thought the therapy was "worth trying".
On Thursday, Hirano told Justice Nicholas Francis that the baby's MRI scan did not necessarily indicate structural damage to the brain. He said the better muscular strength would also allow a better assessment of his brain condition.
In addition to evaluating Charlie, Hirano will meet with doctors and others, on Monday and Tuesday, who have been caring for him.
Francis will then consider information from Hirano to inform a decision from the court, which he has said he hopes to render by July 25.