We have to be careful about
using PSADT as a surrogate endpoint for survival. It is just one of many factors that enter into it. It is certainly a prognostic factor, but it is only one. We want to make sure that we aren't just treating the PSA - we want to treat the underlying disease.
The use of 5ARIs as part of a hormone cocktail (a GnRH agonist, an anti-androgen, and a 5ARi), sometimes called ADT3, was hyped for awhile. But then Klotz did an actual randomized clinical trial. What he found was that those who continuously used a 5ARi, even on the off-cycle, actually did no better than those who stopped using it altogether on their vacations.
/www.ncbi.nlm.nih.gov/pmc/articles/PMC4250242/