A doctor and medical director at University Hospital Southampton NHS Foundation Trust has said that critically ill Ashya King has a "70-80% chance of survival".
The chances of surviving the condition Ashya has are about 70-80% after five years so we believe that he has a good chance of a successful outcome provided he gets access to the most appropriate treatment.
Dr Marsh said that the hospital trust "regretted" that the communication and relationship with the King family had "broken down" and for "whatever reason they have lost confidence in us".
Ashya King's parents told the Daily Mail they fled the UK after being told NHS treatments would leave him with life-long disabilities.
The head of the police force which applied for a European Arrest warrant against the parents of Ashya King has now urged their release.
A British mother whose son's life was saved by proton therapy has told ITV that she defied NHS doctors' advice to pursue the treatment.