Abstract | BACKGROUND: OBJECTIVE: To test the hypothesis that vaccine therapy in this early disease setting will be safe and have a biochemical effect that would support future studies of immunotherapy in patients with minimal disease burden. DESIGN, SETTING, AND PARTICIPANTS: OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS: Step 1 primary end points included progression at 6 mo and characterization of change in PSA velocity pretreatment to post-treatment. Step 2 end points included PSA response with combined vaccine and androgen ablation. RESULTS AND LIMITATIONS: In step 1, 25 of 40 eligible patients (63%) were progression free at 6 mo after registration (90% confidence interval [CI], 48-75). The median pretreatment PSA velocity was 0.13 log(PSA)/mo, in contrast to median postregistration velocity of 0.09 log(PSA)/mo (p=0.02), which is an increase in median PSA doubling time from 5.3 mo to 7.7 mo. No grade ≥4 treatment-related toxicity was observed. In the 27 patients eligible and treated for step 2, 20 patients achieved a complete response (CR) at 7 mo (CR rate: 74%; 90% CI, 57-87). Although supportive of larger studies in the cooperative group setting, this study is limited by the small number of patients and the absence of a control group as in a phase 3 study. CONCLUSIONS: A viral PSA vaccine can be administered safely in the multi-institutional cooperative group setting to patients with minimal disease volume alone and combined with androgen ablation, supporting the feasibility of future phase 3 studies in this population. PATIENT SUMMARY: These data support consideration of vaccine therapy earlier in the course of prostate cancer progression with minimal disease burden in future studies of vaccine approaches in earlier stages of disease.
|
Authors | Robert S DiPaola, Yu-Hui Chen, Glenn J Bubley, Mark N Stein, Noah M Hahn, Michael A Carducci, Edmund C Lattime, James L Gulley, Philip M Arlen, Lisa H Butterfield, George Wilding |
Journal | European urology
(Eur Urol)
Vol. 68
Issue 3
Pg. 365-71
(Sep 2015)
ISSN: 1873-7560 [Electronic] Switzerland |
PMID | 25533418
(Publication Type: Clinical Trial, Phase II, Journal Article, Multicenter Study, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
|
Copyright | Copyright © 2014 European Association of Urology. All rights reserved. |
Chemical References |
- Androgen Antagonists
- Cancer Vaccines
- PROSTVAC
- Granulocyte-Macrophage Colony-Stimulating Factor
- KLK3 protein, human
- Kallikreins
- Prostate-Specific Antigen
|
Topics |
- Aged
- Androgen Antagonists
(therapeutic use)
- Cancer Vaccines
(immunology, therapeutic use)
- Combined Modality Therapy
- Disease Progression
- Fowlpox virus
(immunology)
- Granulocyte-Macrophage Colony-Stimulating Factor
(therapeutic use)
- Humans
- Kallikreins
(blood, immunology)
- Male
- Middle Aged
- Prostate-Specific Antigen
(blood, immunology)
- Prostatectomy
- Prostatic Neoplasms
(drug therapy)
- Vaccinia virus
(immunology)
|