Cancer treatment: Is proton beam therapy suitable for everybody?
In 2014, the story of five-year-old brain tumour patient Ashya King put proton beam therapy (PBT) in the spotlight and sparked an international manhunt after his parents took him out of a UK hospital where he was being treated in a bid to get PBT for their son abroad.
Ashya finally had the treatment in Prague, and last year his father Brett said his son was cancer-free.

