Ah yes! The sound of doctors whistling in the dark to keep their spirits up.
It is meant to be reassuring but ‘you’ll die with it, not of it’ must rank as one of the least useful phrases known to medical science. It is true, epidemiologically speaking, in medical science - but it is not useful in patient care. It’s the least useful phrase known in patient care.
It's trotted out to men diagnosed with prostate cancer.