Please read my post 54 and then I would like your opinion if you don’t mind. Btw, are you a doctor? You made many good points here regardless, just curious.
If the condition of your relative was such that a four-year survival was possible after treatment, then no DNR order should have been requested.
Usually, tumors eroding into the airway lead to gory and spectacular death, and efforts to reverse the process end in disaster, with everyone in the room soaked in blood and the patient dead.
Glad you had such a good result.