Related Experiment Video
Updated: Aug 21, 2026
A Bioluminescent and Fluorescent Orthotopic Syngeneic Murine Model of Androgen-dependent and Castration-resistant Prostate Cancer
Published on: March 6, 2018
PSA doubling time post radiation: the effect of neoadjuvant androgen ablation
S Tyldesley1, A Coldman, T Pickles
1Department of Radiation Oncology, British Columbia Cancer Agency, Vancouver, BC, Canada.
Objective:
To determine whether men who relapse after neoadjuvant androgen ablation (NAA) and high-dose radiation therapy (RT) have faster PSA doubling times(PSAdt) than those who are treated with RT alone.
Materials And Methods:
From a prospective database of 1880 patients treated with RT for localized prostate cancer, patients were selected for further study if they had a rising PSA profile >1 ng/ml, and were treated with either no NAA, or prolonged NAA (defined as 3-12 months NAA) with a minimum 5 years follow-up. ThePSAdt was calculated from the exponential line of best fit from the first post-nadir value >1 ng/ml to the last PSA prior to secondary intervention. Those patients with a rising PSA profile at 5 years of follow-up were further examined with linear regression to determine factors of possible independent adverse effect.
Results:
There were 251 patients eligible with rising PSA profiles. Patients treated with NAA had higher pre-treatment Gleason scores (p
Conclusion:
The use of prolonged NAA in men treated with RT does not itself cause a more rapid PSAdt when relapse occurs. Faster relapse observed in these men is due to intrinsically more aggressive tumors prior to treatment.
