This plot shows men that either don't have PCa (Group A) or newly diagnosed men with PCa by biopsy (Group B). Neither group is on ADT.
Dutasteride monotherapy (0.5 mg/day) causes an average drop in PSA of about 50% in both Groups, and an average drop of about 20% in prostate volume. In one man, his PSA dropped from 43 to 3 (a 93% drop)!
About 15% of men in Group A are non-responders, and about 35-40% of men in Group B are non-responders to Dutasteride monotherapy.