Very interesting:
www.tengion.com/
You can even invest in it: (NasdaqGM: TNGN)
There is also a video explaining the process on the site.
They have already finished Phase II trials as well but not with BC. The problems I see are that they require 8 weeks to build the thing and that may take too much for a BC patient. Also, they have to make sure that the cells the new bladder is constructed from are not cancerous...
M.