If a patient or loved one has made it very clear that they do not want any extraordinary life saving measures and have signed a DNR, do you feel there is any reason for a doctor or family member to ignore it and do whatever it takes to save their life if they can be saved? Please explain your answer.

If a patient or loved one has made it very clear that they do not want any extraordinary life saving measures and have signed a DNR, do you feel there is any reason for a doctor or family member to ignore it and do whatever it takes to save their life if they can be saved? Please explain your answer.