Sally Roberts has exclusively told ITV Daybreak that she is concerned that radiotherapy treatment could be damaging to her son Neon, by affecting his DNA.
She said there are "so many" other treatments that her son could be having instead.
More top news
Tuesday: A cloudy, cool and dull day with outbreaks of heavy rain becoming lighter and patchier.
The former England cricketer fears England will become "cluttered" unless it leaves the EU.
Jean-Louis Cayrou, 54, was found guilty of murdering his ex-lover Patricia Wilson, 58, after their relationship broke down.