Michio Hirano, a professor of neurology at the Columbia University Medical Centre in NY, is scheduled to examine Charlie for the first time before discussing his condition with Great Ormond Street doctors and other medical experts.
Specialists at Great Ormond Street Hospital have fought the parents' bid for treatment because they don't think it will help and may cause him pain.
A judge ruled that Charlie's mother Connie Yates could be present for the gathering.
Great Ormond Street Hospital requested a new hearing after the New York-based neurologist claimed his treatment could now have a better chance of working.
Charlie has infantile onset encephalomyopathic mitochondrial DNA depletion syndrome.
His anguished parents, Chris Gard and Connie Yates, are desperate for the trial to go ahead and have raised funds to bring him to the US.
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They say life support treatment should stop.
But Dr Hirano, 55, believes his experimental theory could give Charlie "11% to 56% chance of clinically meaningful improvement".
The couple, who are in their 30s and come from Bedfont, west London, want Mr Justice Francis to re-open the case in light of the new evidence.
Hirano, who testified via video-link on Thursday, said it was worth trying treatment that has recently emerged.
Charlie's parents, Chris Gard and Connie Yates, have raised £1.3 million (US$ 1.7 million) to take the baby to the USA for nucleoside therapy.
The European Court of Human Rights also decided not to intervene in the case.
In April the judge ruled in favour of Great Ormond Street and said Charlie should be allowed to die with dignity.
Alasdair Seton-Marsden, who represents Charlie Gard's family to the press, has said baby Charlie has become "a prisoner of the state".
The Duchess and Duke and Cambridge, Polish President Andrzej Duda and his wife at the presidential palace in Warsaw. In both countries, William and Kate will meet with survivors of the Holocaust and Nazi oppression.
Démis de ses fonctions d'entraîneur du Stade Lavallois en avril dernier, Marco Simone ne sera pas resté longtemps sans activité. Diverses sources locales évoquent des négociations bien avancées entre les différentes parties.
It may leave many in surprise but the latest drug mafia busted out recently shattered many who have been involved. Many schools and colleges have been issued notices on this and the investigation is on now .
Commercial Metals Company (NYSE:CMC) share price increased in the last trading session with a previous 52-week high of $24.64. On November 9 the company was upgraded to "Buy" from "Hold" and a price target of $20.00 was set by analysts at Jefferies.
La famille, originaire d'Indre-et-Loire, a décidé de partir en pèlerinage à Lourdes et a donc quitté Cauterets dans la matinée. Le minibus a terminé sa chute dans le jardin de la seule maison d'habitation des gorges de Pierrefite.
He said officers arrived at the address and when it became a shooting he alerted the BCA, which now leads the investigation. We'll update with more information as it becomes available. "That work is underway, but will not be complete today".
Well, considering that Arc System Works has its hands full with Dragon Ball FighterZ , we assumed it would be a while. This is a crossover fighting game for the BlazeBlue CentralFiction, Persona 4 Arena , Under Night In-Birth, and RWBY .
Le manager de l'équipe, Vincent Lavenu s'exprime sur les chances de Romain Bardet de conquérir le maillot jaune. La 16e étape mardi repart du Puy-en-Velay, ville auvergnate terme de l'arrivée de la 15e étape dimanche.
I have access to the very most cutting edge AI, and I think people should be really concerned about it. AI. "The pen is mightier than the sword", Musk said.
Israel reopens al-Aqsa Mosque compound
Jews are permitted to visit the mosque but are forbidden to pray at the site to avoid stirring up any possible conflict . The Jerusalem shrine has been the scene of repeated confrontations, including during the current wave of violence .
Ricciardo happy to take 'TV time' from Hamilton
But the German made it clear that he will still be competitive when the lights go out at the Northamptonshire venue. Damage to Sainz's auto saw him retire and the Safety vehicle deployed.
The First Look At The Ataribox, Atari's New Console
The only thing we do know is that it'll have an SD card slot, four USB ports, and what looks like an Ethernet port on the back. Our objective is to create a new product that stays true to our heritage while appealing to both old and new fans of Atari.
Everton Moving Quick To Catch Walcott
He would be a great addition to Koeman's side and his know-how in the Premier League could see him make an immediate impact. Arsenal could be loathe to sell to a direct rival, but may not have a choice if Walcott wants to leave the club.
Martin Landau, Oscar-winning actor, dies at 89
Landau's acting dreams came true in 1955 when he auditioned for Lee Strasberg and was accepted into the Actors Studio . His stage debut was in summer 1951 in "Detective Story" at the Peaks Island Playhouse in Maine.
HTC U11 users can now install Amazon's Alexa assistant
When enabled, Alexa will permanently live in your notification shade with suggestions for what you can ask Alexa. They all feature Google's Assistant, however, Alexa seems to be the more popular choice for smartphone users.