[rob74]

Halfway through the article, they spell out what they mean by "cuts risk of death by half":

> After five years, 88% of patients who took the daily pill after the removal of their tumour were still alive, compared with 78% of patients treated with a placebo.

...which is still remarkable, but doesn't sound quite as good as "cutting by half".

[ieeamo]

After 5 years, (i) Placebo: 22% mortality, (ii) Daily Pill: 12% mortality.

45% reduction in 5-year mortality. Quite close to “cutting by half”