Tony,
I think there is some, but not a lot of data that support that HT is a viable treatment as a front line therapy. Liebowitsz on his web site publishes a few studies he did years ago which showed that 93 patients were given ADT3 for 13 months and about 90% or so achieved long term remission. He has more data from other patients and has requested that if anyone would compile the data they can have it as he is way too busy with his practice. If you look at the published papers on his website they are interesting reading. (Compassionateoncology.com)
I think it it as viable a treatment option as any other and as other treatments require some tradoffs.
The positives:
1. For localized PC has cure rates similar to other therapies.
2. All side affects are reversible once stopped.
3. Is not an invasive treatment
4. Good option for patients that refuse surgery or radiation for personal reasons.
Negatives:
1. No long term studies of effectiveness as a 1st line therapy, only a few studies that have not been verified.
2. Has some severe side affects including complete loss of libido while on the drugs.
3. Need a specialist to monitor and get the best results.
4. Treatment is long term, 13 to 24 months, and there is no fast closure.