Preclinical studies demonstrated the ability of an adenovirus/PSA (Ad/PSA) vaccine to induce strong anti-PSA immune responses, and these responses were capable of destroying prostate-specific antigen (PSA)-secreting mouse prostate tumors.
A series of preclinical studies have demonstrated the superiority of the Ad/PSA vaccine to other PSA vaccines for the induction of anti-PSA immune responses, the ability of Ad/PSA vaccination combined with cytokine gene therapy and the TLR9 agonist CpG to enhance the anti-prostate tumor immunotherapy, and the reduction of negative regulatory elements when the vaccine was combined with 5-fluoruracil administration. A phase I clinical trial of the Ad/PSA vaccine in men with metastatic castrate-resistant prostate cancer demonstrated the safety of the vaccine even at the highest single dose permitted by the FDA. Currently, a phase II trial of the Ad/PSA vaccine is underway treating patients in two protocols. Thus far 81 patients have been enrolled and vaccinated. Early results from the patients evaluated to date demonstrated the induction of anti-PSA T cell responses, and the majority of patients evaluated at this time had demonstrated an increase in PSA doubling times.
Written by:
Lubaroff DM, Vaena D, Brown JA, Zehr P, Griffith KC, Brown E, Eastman J, Nepple K, Kattula A, Williams RD. Are you the author?
Department of Urology, University of Iowa, 375 Newton Road, Iowa City, IA, 52242, USA.
Reference: Immunol Res. 2014 May 22. Epub ahead of print.
doi: 10.1007/s12026-014-8531-2
PubMed Abstract
PMID: 24847764
UroToday.com Prostate Cancer Immunotherapy Section
