The MAYO Clinic is also looking into this. Here is a quote from their Web
Site:

http://www.mayoclinic.org/bph/research.html

"Investigational therapies
Mayo Clinic urologists are studying injection of enzymes, Botox and other
substances to destroy prostate tissue. These would also be minimally
invasive outpatient therapies that do not need anesthesia. Studies planned
for the near future will help to identify the advantages and disadvantages
of this technique, as well as the patients most likely to benefit from it."

Joeo