A most cancers remedy at the centre of an nhs controversy in 2014 reasons fewer aspect outcomes in children than conventional radiotherapy, according to new research.
The observe, posted within the lancet oncology, shows proton beam remedy is as effective as other treatments.
Researchers checked out 59 sufferers aged among 3 and 21 from 2003 to 2009.
In 2014 the mother and father of ashya king took him out of sanatorium in hampshire to get the treatment abroad.
Their actions led to a police operation to locate them.
Ashya, who became five at the time of his treatment, is now most cancers unfastened, his family said remaining year.
All the sufferers who took component inside the observe, led by means of dr torunn yock from the massachusetts trendy health center within the us, had the most commonplace sort of malignant brain tumour in children, referred to as medulloblastoma.
After 5 years, their survival price turned into just like that of patients handled with conventional x-ray radiotherapy, but there were fewer side consequences to the coronary heart and lungs, the observe observed.
Dr yock told bbc radio five stay: "the main finding is that proton therapy is as effective as photon therapy [conventional X-ray radiotherapy] in curing these patients and what is likewise very interesting is that it's miles keeping these excessive quotes of cure but doing so with much less past due toxicity, which has dramatic first-rate of lifestyles improvements."
The paper stated: "proton radiotherapy led to proper toxicity and had similar survival outcomes to those referred to with traditional radiotherapy, suggesting that the usage of the remedy can be an alternative to photon-based totally treatments."
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