Odd, I thought colloidal gold was a common part of cancer treatments?
I don't know anything about that. A quick search, though, came up with this:
http://www.ebsciences.com/papers/cationic.htm
It sounds like they inject the gold and then measure how the electronic discharge of the cells change because of the gold. If this is accurate, the gold is not being processed, but is sort of serving as an amalgam as mercury once did in extracting gold.
As I said, I don't really know anything about this subject.