What do you mean? If a person comes in with cancer, what does "treating the person" mean in that context?
Bedside manner, placebo effect.
It is of substantial benefit (and can be pretty cheap).
Alternative medicine is almost all placebo, and no medicine.
Evidence based medicine is almost all medicine, and very little placebo.
Given the power of the placebo effect (not as powerful as real medicine for everything, but for some conditions it's close), it does make sense to use both of them, it just isn't done these days.
We need to study the placebo effect itself- find out what works and what doesn't; what the best practices are, what the best words are, tone of voice, down to every last detail of environment and doctor/nurse patient interaction, even down to the colour, shape, taste and smell of the medicine itself.
We flavour it and make it pretty, but sometimes nasty, ugly looking things that smell bad have a more potent placebo effect. What if the medicine glowed? What if it fizzed?
Chanting, meditation, etc. These things can all be very powerful placebos.
Without losing perspective (and actually buying into the efficacy beyond the placebo effect), we need to put some of those things into practice.