And on the other hand, it was used in high and very-high risk cases, where it's more likely that there's undetected cancer outside the area being treated. As the article mentioned, the main issue right now is that there's not enough hard data to show where it is or isn't appropriate.

This also highlights the ongoing dilemma:

More-focussed treatment: lower risk of side-effects, higher risk of missing some undetected cancer spread

Less-focussed treatment: higher risk of side-effects, lower risk of missing some undetected cancer spread

Unfortunately, life doesn't hand out many freebies. 😟