Abstract
Background
We previously reported overexpression of heat-shock protein (HSP) 70 in hepatitis C virus (HCV)-related hepatocellular carcinoma (HCC) using proteomic profiling and immunohistochemical staining (IHS). This suggested that HSP70 could be a molecular target for treatment of HCC.
Methods
Twelve patients with HCV-related HCC were enrolled in a phase 1 clinical trial. Dendritic cells (DCs) transfected with HSP70 mRNA (HSP70-DCs) induced by electroporation were injected intradermally. Patients were treated three times every 3 weeks. The number of HSP70-DCs injected was 1 × 107 as the lowest dose, then 2 × 107 as the medium dose, and then 3 × 107 as the highest dose. Immunological analyses were performed.
Findings
No adverse effects of grade III/IV, except one grade III liver abscess at the 3 × 107 dose, were observed. Thus, we added three more patients to confirm whether 3 × 107 is an appropriate dose. Eventually, we chose 3 × 107 as the recommended dose of DCs. Complete response (CR) without any recurrence occurred in two patients, stable disease in five, and progression of disease in five. The two patients with CR have had no recurrence for 44 and 33 months, respectively. IHS in one patient who underwent partial hepatectomy showed infiltration of CD8+ T cells and granzyme B in tumors, indicating that the dominant immune effector cells were cytotoxic T lymphocytes with tumor-killing activity.
Interpretation
This study demonstrated that HSP70-DCs therapy is both safe and feasible in patients with HCV-related HCC. Further clinical trials should be considered.
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Abbreviations
- AFP:
-
α-Fetoprotein
- CR:
-
Complete response
- CT:
-
Computed tomography
- CTCAE:
-
Common Terminology Criteria for Adverse Events version 3.0
- CTL:
-
Cytotoxic T cell
- DCs:
-
Dendritic cells
- ECOG PS:
-
Eastern Cooperative Oncology Group Performance Status
- ELISPOT:
-
Enzyme-linked immunospot
- FITC:
-
Fluorescein isothiocyanate
- GM-CFS:
-
Granulocyte–macrophage colony-stimulating factor
- HBV:
-
Hepatitis B virus
- HCC:
-
Hepatocellular carcinoma
- HCV:
-
Hepatitis C virus
- HSP:
-
Heat-shock protein
- HSP70-DCs:
-
HSP70 mRNA-transfected DCs
- IFN-γ:
-
Interferon gamma
- IHS:
-
Immunohistochemical staining
- IL-4:
-
Interleukin-4
- IM-DCs:
-
Immature DCs
- mAb:
-
Monoclonal antibodies
- M-DCs:
-
Mature DCs
- MRI:
-
Magnetic resonance imaging
- PBMCs:
-
Peripheral blood mononuclear cells
- PD:
-
Progression of disease
- PIVKA-II:
-
Vitamin K absence or antagonist II
- RECIST:
-
Response Evaluation Criteria in Solid Tumors guideline version 1.1
- RFA:
-
Radiofrequency ablation
- SD:
-
Stable disease
- SE:
-
Standard error
- TAA:
-
Tumor-associated antigens
- TACE:
-
Transcatheter arterial chemoembolization
- TNF-α:
-
Tumor necrosis factor-α
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Acknowledgments
This study was funded by KAKEN 20591612. We thank Ms. Akiko Sano, Ms. Kaori Kaneyasu, and Ms. Yuko Yanai for their excellent technical assistance.
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The authors have no conflict of interest.
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Maeda, Y., Yoshimura, K., Matsui, H. et al. Dendritic cells transfected with heat-shock protein 70 messenger RNA for patients with hepatitis C virus-related hepatocellular carcinoma: a phase 1 dose escalation clinical trial. Cancer Immunol Immunother 64, 1047–1056 (2015). https://doi.org/10.1007/s00262-015-1709-1
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DOI: https://doi.org/10.1007/s00262-015-1709-1