A judge said 7-year-old Neon Roberts should receive radiotherapy against his mothers wishes today.
Sally Roberts said she feared that radiotherapy would cause long-term harm to her son Neon, and argued that "credible" alternative treatment was available.
Specialists treating Neon accepted that there were side-effects to radiotherapy but said that without the treatment the youngster could die within a few months.
Mr Justice Bodey, who heard evidence at a hearing in the Family Division of the High Court in London, said radiotherapy treatment could start.
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Icy conditions expected after a freezing night. The far west will enjoy sunny spells while the rest of the region sees increasing cloud.
Icy conditions expected after a freezing night. Early cloud will break up leaving sunny spells, light winds and temperatures at 8 degrees.