Summary
Background Given the immunogenicity of NY-ESO-1 peptides in prostate cancer, a phase I clinical trial was designed to evaluate HLA class-I and class-II restricted NY-ESO-1 peptides in metastatic castration-resistant prostate cancer (mCRPC). Methods Patients with progressive mCRPC, Zubrod Performance Status ≤2, PSA ≥10 ng/ml who had appropriate HLA class I (A2) and class II haplotypes (DR4, DP4) were eligible. Three groups with 3 patients each received the vaccine subcutaneously every 2 weeks for 6 doses. Group 1 received a peptide presented by an HLA class I haplotype (HLA-A2), Group 2 with a peptide presented by HLA class II haplotype (DR4, DP4), and Group 3 with peptides presented by both Class I and II haplotypes. Androgen-deprivation was continued. Owing to a myocardial infarction, the protocol was amended to omit the use of GM-CSF. Results Fourteen patients were evaluable for toxicities and 9 received all 6 doses and were evaluable for efficacy. One death from myocardial infarction following GM-CSF occurred in a patient with generalized myalgias. After omitting GM-CSF, no grade >2 toxicities were observed. Among 9 patients evaluable for efficacy, the median PSA doubling time pre-therapy and during therapy were 3.1 and 4.92 months, respectively. NY-ESO-1 specific T-cell response observed by ELISPOT appeared more frequent in docetaxel-naïve patients (4 of 4) than docetaxel-pretreated patients (2 of 5). Conclusion In men with mCRPC, individualized HLA class-I and/or class-II restricted NY-ESO-1 peptides were tolerable, appeared to slow PSA doubling time and yielded antigen-specific T-cell responses more often in chemonaïve patients.
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Acknowledgments
This work was in part supported by grants from the National Institutes of Health (Grant number NIH Specialized Programs of Research Excellence CA58204) as well as by grants from National Cancer Institute, NIH (R01CA090327, R01CA101795, R01CA116408 and R01CA121191) to R.F.W. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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Guru Sonpavde and Mingjun Wang receive equal credit.
Rong-Fu Wang and Teresa G. Hayes share the corresponding authorship.
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Sonpavde, G., Wang, M., Peterson, L.E. et al. HLA-restricted NY-ESO-1 peptide immunotherapy for metastatic castration resistant prostate cancer. Invest New Drugs 32, 235–242 (2014). https://doi.org/10.1007/s10637-013-9960-9
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DOI: https://doi.org/10.1007/s10637-013-9960-9