In the video at the mayo clinic site they talk a bit more about patient 2. While not all tumors were destroyed, they were fully mapped due to compounds from the thyroid being attached to the virus, implying that localized treatment would then be possible.

http://www.mayoclinicproceedings.org/article/S0025-6196(14)0...

Editorial Article: http://www.mayoclinicproceedings.org/article/S0025-6196(14)0...