Abstract:
:PSMA-VRP is a propagation defective, viral replicon vector system encoding PSMA under phase I evaluation for patients with castration resistant metastatic prostate cancer (CRPC). The product is derived from an attenuated strain of the alphavirus, Venezuelan Equine Encephalitis (VEE) virus, and incorporates multiple redundant safety features. In this first in human trial, two cohorts of 3 patients with CRPC metastatic to bone were treated with up to five doses of either 0.9×10(7)IU or 0.36×10(8)IU of PSMA-VRP at weeks 1, 4, 7, 10 and 18, followed by an expansion cohort of 6 patients treated with 0.36×10(8)IU of PSMA-VRP at weeks 1, 4, 7, 10 and 18. No toxicities were observed. In the first dose cohort, no PSMA specific cellular immune responses were seen but weak PSMA-specific signals were observed by ELISA. The remaining 9 patients, which included the higher cohort and the extension cohort, had no PSMA specific cellular responses. PSMA-VRP was well-tolerated at both doses. While there did not appear to be clinical benefit nor robust immune signals at the two doses studied, neutralizing antibodies were produced by both cohorts suggesting that dosing was suboptimal.
journal_name
Vaccinejournal_title
Vaccineauthors
Slovin SF,Kehoe M,Durso R,Fernandez C,Olson W,Gao JP,Israel R,Scher HI,Morris Sdoi
10.1016/j.vaccine.2012.11.096subject
Has Abstractpub_date
2013-01-30 00:00:00pages
943-9issue
6eissn
0264-410Xissn
1873-2518pii
S0264-410X(12)01747-1journal_volume
31pub_type
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