Doctors are worried that a potentially problematic precedent has been set, because the NHS eventually agreed to pay for Ashyas treatment after the family went on to Prague where Ashya received proton therapy.
They say other parents are already asking for proton therapy, which is not yet available in the UK. They warn that, in the case of a cancer like Ashyas, timing is crucial and to travel abroad for treatment involves delays that could affect the outcome.
There are serious concerns in the medical community over Ashyas case. Delays were caused by the flight to Spain, where the Kings have a property they had planned to sell to raise funds, and court proceedings in the UK to decide what treatment the boy should have. In the treatment of Ashyas cancer, called medulloblastoma, radiotherapy should take place between four and six weeks after surgery but Ashyas did not start until more than seven weeks had passed. More importantly, the doctors say, Ashyas chances of survival could be affected because he has not had the full treatment package. His parents have refused chemotherapy for him.
While he was based at the Motol hospital in Prague, travelling daily to the private proton therapy clinic, the Kings signed waivers to exempt their son from the drug infusions that doctors had prescribed and the British court had ordered. Brett King, Ashyas father, said in a TV interview that he did not believe his son needed chemotherapy.
Roger Taylor, professor of clinical oncology at the College of Medicine, Swansea University, said good outcomes for children with Ashyas condition were achieved only through the full combination of surgery, radiotherapy and chemotherapy.
Its only with that package of treatment that you achieve that 70-80% survival, he said. We do know from past experience the approximate outcomes without chemotherapy. In North America, there was a trial of two different doses of radiotherapy without chemotherapy. Survival was in the range of 50-55%.
It is understood the Kings are interested in immunotherapy for Ashya instead an experimental approach being attempted by a few scientists which tries to prime the immune system to fight cancer cells, but is generally attempted only in cancer patients who have run out of other options. It is not used anywhere as a substitute for chemotherapy, said Taylor.