Abstract
Purpose
Despite successful primary treatment of nasopharyngeal carcinoma (NPC), the incidence of distant metastasis remains 25–34 %. Treatment options are limited, and survival is poor. Intratumoural Epstein–Barr virus (EBV) was used as treatment target. In NPC, EBV is present in a latent state, expressing only few non-immunogenic viral products. Gemcitabine and valproic acid can trigger EBV to the lytic state, wherein viral kinases are expressed, making EBV-positive tumour cells susceptible for antiviral therapy with, i.e. valganciclovir, and inducing an EBV-specific immune response.
Methods
This drug combination was applied in eight patients with EBV-positive NPC, refractory to conventional treatment. The primary endpoints were safety, tolerability and clinical response. Secondary endpoint was to get proof of concept based on biomarkers, i.e. pharmacokinetics, EBV-DNA load in whole blood and nasopharyngeal brushes, EBV-RNA profiling for proof of lytic induction, EBV-IgG and EBV-IgA levels and diversity and EBV-specific T cell response.
Results
The best observed clinical response was partial in two patients (25 %) and stable disease in three patients (37.5 %). The median survival was 9 months (95 % confidence interval 7–17 months). Effective dose levels were reached. Peaking of EBV-DNA loads in blood and brush proved the biological effect on EBV during most treatment cycles. In one patient, RNA profiling confirmed lytic EBV induction. EBV-IgG and EBV-IgA antibody levels were already high before treatment and did not change during treatment. No changes in EBV-specific T cell response were detected.
Conclusion
The treatment was safe with manageable side effects, clinical response was observed, and viral activation corroborated.
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Acknowledgments
This study was supported by Grant ZonMW 95110069 from the Netherlands Government and Grants KWF VU2011-4555, KWF-VU2010-4809 from the Netherlands Cancer Society.
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The authors declare that they have no conflict of interest.
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Sharon D. Stoker and Zlata Novalić have contributed equally.
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Stoker, S.D., Novalić, Z., Wildeman, M.A. et al. Epstein–Barr virus-targeted therapy in nasopharyngeal carcinoma. J Cancer Res Clin Oncol 141, 1845–1857 (2015). https://doi.org/10.1007/s00432-015-1969-3
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DOI: https://doi.org/10.1007/s00432-015-1969-3