What type of personality is best for an oncologist?

I think an oncologist should be patient, attentive... how do i say this? not get attached to the patient... because alot of them will be terminal... so sad... =) i noe im one of them patients... anyways; i think they should be kind and helpful but not emotionally attached because then it'll hurt and you can't be responsible for the death of every cancer patient i ought to know; i'e lost quite a few to cancer mc