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The family of Charlie Gard have tweeted their “fight is not over” ahead of a demonstration outside Great Ormond Street Hospital (GOSH).

Parents Connie Yates and Chris Gard are expected to join the protest, which will see a 350,000-name petition handed over calling on GOSH doctors to allow the terminally ill baby to travel and receive experimental treatment.

The couple, from Bedfont and both in their 30s, have seen their fight boosted in recent days with support coming from the Pope and US President Donald Trump , after they lost a lengthy battle which ruled in favour of doctors from GOSH, who argued the therapy would not improve Charlie’s quality of life.

Writing on the @charliesfight Twitter account, they said: “A HUGE thank you to all you out there supporting and sharing Charlie’s story!please keep going!the fight is not over!!!! #charliegard”.

A banner hung on railings outside Great Ormond Street Hospital for Children

It comes after GOSH said on Friday (July 7) it had applied to the High Court for a fresh hearing “in light of claims of new evidence relating to potential treatment for his condition”.

The decision was prompted by claims of “new information” from researchers at the Vatican’s children’s hospital.

Clinicians from the Bambino Gesu paediatric hospital’s neurosciences department said tests in mice and patients with a similar, but not the same, genetic condition as Charlie had shown “dramatic clinical improvements”.

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Charlie inherited the faulty RRM2B gene from his parents, affecting the cells responsible for energy production and respiration and leaving him unable to move or breathe without a ventilator. The therapy is not a cure.

GOSH describes experimental nucleoside therapies as “unjustified” but its decision comes after two international hospitals and their researchers contacted them “as late as the last 24 hours” to say they have “fresh evidence about their proposed experimental treatment”.

Under a High Court ruling , GOSH is forbidden from allowing Charlie to be transferred for nucleoside therapy anywhere.

GOSH also points out that the ruling calls for Charlie’s artificial ventilation to be withdrawn and he should receive palliative care only.

Ms Yates has said her son was “not in pain or suffering” and she had been given hope by international attempts to come to Charlie’s aid, including from The Vatican and White House.

GOSH said it will now be for the High Court to make its judgment on the facts and it is acting in Charlie’s best interests.

The hospital describe his condition as exceptionally rare, with catastrophic and irreversible brain damage.

Previous legal attempts by Charlie’s parents failed as judges in the High Court, Court of Appeal and Supreme Court in London ruled in favour of GOSH doctors, while the European Court of Human Rights declined to hear the couple’s appeal.

Charlie’s case will be heard by Mr Justice Francis on Monday at 2pm, according to a High Court listing.