Abstract:
BACKGROUND:Cancer vaccine is one of the attractive treatment modalities for patients with castration-resistant prostate cancer (CRPC). However, because of delayed immune responses, its clinical benefits, besides for overall survival (OS), are not well captured by the World Health Organization (WHO) and Response Evaluation Criteria in Solid Tumors (RECIST) criteria. Several surrogate markers for evaluation of cancer vaccine, including prostate-specific antigen doubling time (PSADT), are currently sought. The purpose of this study was to assess prospectively the PSA kinetics and immune responses, as well as the efficacy, safety, and biomarkers of personalized peptide vaccination (PPV) in progressive CRPC. METHODS:One hundred patients with progressive CRPC were treated with PPV using 2-4 positive peptides from 31 candidate peptides determined by both human leukocyte antigen (HLA) class IA types and the levels of immunoglobulin G (IgG) against each peptide. The association between immune responses and PSADT as well as overall survival (OS) was studied. RESULTS:PPV was safe and well tolerated in all patients with a median survival time of 18.8 months. Peptide-specific IgG and T-cell responses strongly correlated with PSADT (p < 0.0001 and p = 0.0007, respectively), which in turn showed correlation with OS (p = 0.018). Positive IgG responses and prolongation of PSADT during PPV were also significantly associated with OS (p = 0.001 and p = 0.004) by multivariate analysis. CONCLUSIONS:PSADT could be an appropriate surrogate marker for evaluation of the clinical benefit of cancer vaccine. Further randomized trials are needed to confirm these results. TRIAL REGISTRATION:UMIN000001850.
journal_name
BMC Cancerjournal_title
BMC cancerauthors
Noguchi M,Moriya F,Suekane S,Ohnishi R,Matsueda S,Sasada T,Yamada A,Itoh Kdoi
10.1186/1471-2407-13-613subject
Has Abstractpub_date
2013-12-30 00:00:00pages
613issn
1471-2407pii
1471-2407-13-613journal_volume
13pub_type
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