Neon was diagnosed with a brain tumour in 2012 and after initial surgery to remove it, his mother tried to prevent the treatment continuing. She went on the run with the boy, evading authorities for four days, believing that radiotherapy would "fry his brain''.
The fight was taken to the High Court in Britain, where a judge ruled Neon should be treated with conventional therapy and live with his father, Ben, at his London home.
Ms Roberts still believed there were alternative treatments available for her son, but said a recent scan had shown there are no signs of the cancer returning, BBC reported.
"I feel exactly the same as a year ago - thrilled. That's what I want to make clear is that he was cancer-free a year ago, which is why I was against the treatment a year ago because I think radiation as a precautionary measure is harsh.'