Great work.
I must admit though, I am always weary about doctors using modified viruses to treat something. Viruses are just so mutable that all it takes is something to go wrong and you can have a whole new outbreak, which with something like HIV is pretty scary. Still given that these people would probably have died from cancer anyway they didn't really have anything to loose. Good for those that it worked for.
It is a pity that it did not work at all on two of the patients. I wonder why not and how that can be fixed.