Abstract
The heterogeneity expression of tumor-associated antigens (TAA) and variability of human T cell repertoire suggest that effective cancer vaccine requires induction of a wide breadth of cytotoxic T lymphocyte (CTL) specificities. This can be achieved with vaccines targeting multiple TAA. We evaluated the safety and immune dynamics of a cancer vaccine consisting of 20 mixed peptides (KRM-20) designed to induce CTLs against 12 different TAA in patients with castration-resistant prostate cancer (CRPC). Patients received each of three different randomly assigned doses of KRM-20 (6, 20, or 60 mg) once a week for 6 weeks. KRM-20 was applicable for patients with positive human leukocyte antigen (HLA) A2, A3, A11, A24, A26, A31 or A33 alleles, which cover the majority of the global population. To evaluate the minimum immunological effective dose (MIED), peptide-specific CTL and immunoglobulin G (IgG) responses, and immune suppressive subsets were evaluated during the vaccination. Total of 17 patients was enrolled. No serious adverse drug reactions were encountered. The MIED of KRM-20 in CTL or IgG response calculated by logistic regression model was set as 16 or 1.6 mg, respectively. The frequency of immune suppressive subsets was fewer in the 20 mg cohort than that in 6 or 60 mg cohort. Clinical responses determined by prostate-specific antigen levels were two partial responses (from the 20 mg cohort), five no changes and ten progressive diseases. Twenty milligrams of KRM-20 could be recommended for further studies because of the safety and ability to augment CTL activity.
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Abbreviations
- CR:
-
Complete response
- CRPC:
-
Castration-resistant prostate cancer
- CTL:
-
Cytotoxic T lymphocytes
- CTLA-4:
-
Cytotoxic T lymphocyte antigen 4
- ECOG:
-
Eastern Cooperative Oncology Group
- EGF-R:
-
Epidermal growth factor receptor
- HLA:
-
Human leukocyte antigen
- HNRPL:
-
Heterogeneous nuclear ribonucleoprotein L
- IgG:
-
Immunoglobulin G
- MDSC:
-
Myeloid-derived suppressor cells
- MRP3:
-
Multidrug resistance-associated protein 3
- PAP:
-
Prostatic acid phosphatase
- PBMC:
-
Peripheral blood mononuclear cells
- PD:
-
Progressive disease
- PFS:
-
Progression-free survival
- PPV:
-
Personalized peptide vaccine
- PR:
-
Partial response
- PSA:
-
Prostate-specific antigen
- PSMA:
-
Prostate-specific membrane antigen
- PTHrP:
-
Parathyroid hormone-related peptide
- SART3:
-
Squamous cell carcinoma antigens 3
- TAA:
-
Tumor-associated antigen
- Treg :
-
Regulatory T cells
- UBE2 V:
-
Ubiquitin-conjugated enzyme variant Kua
- WHSC2:
-
Wolf–Hirschhorn syndrome critical region 2
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Acknowledgments
This study was supported by grants from the Ministry of Health, Labor and Welfare of Japan (M. Noguchi), and Sendai Kousei Hospital (K. Itoh).
Conflict of interest
K Itoh is a consultant/advisory board member in Green Peptide Co. A.Yamada is a part-time executive of Green Peptide Co. No potential conflict of interest is disclosed by other authors.
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Noguchi, M., Arai, G., Matsumoto, K. et al. Phase I trial of a cancer vaccine consisting of 20 mixed peptides in patients with castration-resistant prostate cancer: dose-related immune boosting and suppression. Cancer Immunol Immunother 64, 493–505 (2015). https://doi.org/10.1007/s00262-015-1660-1
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DOI: https://doi.org/10.1007/s00262-015-1660-1