[csours]

> most medical interventions for cancer do not prolong life

Specifically, medical interventions for cancer AS A RESULT of some types of screening do not prolong life.

Medical interventions for symptomatic cancer, and some types of screening, certainly do prolong life, and quality of life.

There are so many confounding factors in this it's hard to do something like a pareto breakdown, but it would certainly be interesting to see.