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Long-term clinical outcome of melanoma patients treated with messenger RNA-electroporated dendritic cell therapy following complete resection of metastases

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Abstract

Purpose

Melanoma patients with a high risk of recurrence may benefit from immunotherapy with mRNA-electroporated autologous monocyte-derived dendritic cells (DCs). Further benefit may be found in combining DC-therapy with interferon alfa-2b.

Patients and methods

The long-term clinical outcome of AJCC stage III/IV melanoma patients who had no evidence of disease at the time of treatment with autologous mRNA-electroporated DCs in a single-center pilot clinical trial was analyzed. Antigen loading was accomplished by co-electroporation of mRNA encoding a fusion protein between MAGE-A1, -A3, -C2, Tyrosinase, MelanA/MART-1, or gp100, and an HLA class II-targeting sequence. DCs were administered by 4–6 bi-weekly intradermal injections. IFN-α-2b (5 MIU TIW) was initiated either at recurrence (cohort 1), concomitant with DCs (cohorts 2 and 3), or following the fourth DC administration (cohort 4).

Results

Thirty melanoma patients were recruited between April 2006 and June 2009. DC-related adverse events included grade 2 local injection site reactions in all patients, grade 2 fever and flu-like symptoms in one patient, and skin depigmentation in seven patients. After a median follow-up of over 6 years, the median relapse-free survival is 22 months (95 % CI 12–32 months). Twelve patients have died. The median overall survival has not been reached; the 2-year and 4-year survival rates are 93 and 70 %, respectively.

Conclusions

Adjuvant therapy following the resection of melanoma metastases with autologous mRNA-electroporated DCs, combined with interferon alfa-2b, is tolerable and results in encouraging long-term overall survival rates justifying further evaluation in a randomized clinical trial.

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Abbreviations

18F-FDG:

18F-fluorodeoxyglucose

AEs:

Adverse events

AJCC:

American Joint Committee on Cancer

caTLR4:

Constitutively active Toll-like receptor 4

CD40L:

CD40 ligand

CI:

Confidence interval

CTLA-4:

Cytotoxic T-lymphocyte-associated antigen 4

CT:

Computed tomography

DC:

Dendritic cell

DTH:

Delayed-type hypersensitivity

GM-CSF:

Granulocyte/macrophage colony-stimulating factor

HLA:

Human leucocyte antigen

IL-2:

Interleukin-2

IL-4:

Interleukin-4

IFN-α-2b:

Interferon alfa-2b

LDH:

Lactate dehydrogenase

MAAs:

Melanoma-associated antigens

MAPK:

Mitogen-activated protein kinase

MIU:

Million international units

MRI:

Magnetic resonance imaging

mRNA:

Messenger ribonucleic acid

OS:

Overall survival

PET–CT:

Positron emission tomography–computed tomography

RFS:

Relapse-free survival

SKILs:

Skin infiltrating lymphocytes

Th1:

T helper type 1

TIW:

Three times in a week

WHO-PS:

World Health Organization Performance Status

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Acknowledgments

We thank the patients who consented to participate in the clinical study, their families, and referring physicians. We are very much indebted to the data managers Katrien Van den Bossche and Kathleen Mooren, and to Elsy Vaeremans, Gwenny De Metter, Inge Betz, Chiraz Mahmoud for excellent technical assistance, and to Prof. Coomans for help with the statistical analyses. This work was supported by grants from the Interuniversity Attraction Poles Program—Belgian State—Belgian Science Policy, the Stichting tegen Kanker, an Integrated Project and a Network of Excellence sponsored by the EU, the Fonds voor Wetenschappelijk Onderzoek Vlaanderen (FWO-Vlaanderen) and the Willy Gepts Wetenschappelijk Fonds of the Universitair Ziekenhuis Brussel. Sofie Wilgenhof is a PhD student of the FWO-Vlaanderen.

Conflict of interest

The use of dendritic cells electroporated with tumor antigen mRNA and TriMix is the topic of a patent (W2009/034172) on which Dr. A. Bonehill and Prof. Dr. K. Thielemans are filed as inventors. None of the authors receive any support or remuneration related to this platform. No potential conflicts of interest were disclosed.

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Correspondence to Sofie Wilgenhof or Bart Neyns.

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Wilgenhof, S., Corthals, J., Van Nuffel, A.M.T. et al. Long-term clinical outcome of melanoma patients treated with messenger RNA-electroporated dendritic cell therapy following complete resection of metastases. Cancer Immunol Immunother 64, 381–388 (2015). https://doi.org/10.1007/s00262-014-1642-8

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  • DOI: https://doi.org/10.1007/s00262-014-1642-8

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