I am for doctor-assisted suicide, as long as there are some measures in place to prevent any misuse. By misuse, I would imply such things as doctors openly or subtly convincing patients that they should undergo doctor-assisted suicide in conditions when the patient would not take such a decision on their own. Also, there are situations where the person may be suffering and want to die, but where other solutions exist which can eleviate their pain and cause them to change their minRAB. Basically, I simply advocate that the use of doctor-assisted suicide has to be approached carefully.
Otherwise, if the patient is suffering and there is no hope, I believe that a person's life is ultimately their own and they have a right to choose to end it. I can well imagine many situations where the patient is either conscious and suffering, or permanently in a vegitative state, where doctor-assisted suicide is the only humane option.