Abstract
Treatment of advanced melanoma patients with ipilimumab results in improved survival. However, only about 20% of treated patients experience long-term benefit. Combining treatment of ipilimumab with other drugs may improve immune activation and potentially enhance clinical efficacy. The aims of the phase II clinical trial reported here were to investigate tolerability and efficacy of a combined immunotherapeutic strategy comprising standard systemic ipilimumab at 3 mg/kg four times at 3-week intervals and intratumorally injected IL-2 at 9 MIU daily twice weekly for four weeks in pretreated melanoma patients with distant metastasis. The primary endpoint was the disease control rate according to immune-related response criteria at week 12; tolerability according to Common Terminology Criteria for Adverse Events criteria was secondary endpoint. No objective responses were observed in the 15 enrolled patients. Three patients had stable disease 12 weeks after starting treatment, yielding a disease control rate of 20%. Tolerability of this combination treatment was acceptable. Observed adverse events were those expected from the respective monotherapies. Autoimmune colitis was observed in two patients. Grade III/IV adverse events were observed in 40% of patients, and no treatment-related deaths occurred. Thus, this combined immunotherapy is associated with adverse events similar to those associated with the respective monotherapies. However, this study does not provide any evidence of improved efficacy of the combination over ipilimumab alone.
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Abbreviations
- AEC:
-
Absolute eosinophil counts
- AJCC:
-
American Joint Committee on Cancer
- CR:
-
Complete response
- irDCR:
-
Immune-related disease control rate
- irRC:
-
Immune-related response criteria
- MIU:
-
Million international units
- mWHO:
-
Modified World Health Organization
- PR:
-
Partial responses
- RLC:
-
Relative lymphocyte counts
- SD:
-
Stable disease
- Tregs:
-
Regulatory T cells
- T-VEC:
-
Talimogene laherparepvec
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Acknowledgements
This study was funded by Bristol–Myers–Squibb (Munich, Germany) to B. Weide.
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B Weide reports receiving commercial research grants from Bristol–Myers Squibb (BMS) and MSD Sharp and Dohme (MSD) and reports receiving travel/accommodations/expenses from BMS, MSD, Roche, Amgen, Philogen, Curevac and compensated advisory services for MSD, BMS, Philogen and Curevac. C. Garbe reports receiving honoraria from BMS, MSD, Amgen, Novartis, Roche, GlaxoSmithKline (GSK) and reports receiving commercial research grants from MSD, BMS, Roche, GSK. T.K Eigentler reports receiving honoraria from BMS, MSD, Roche and Novartis, travel/accommodations/expenses from BMS and is a consultant/advisory board member for BMS. No potential conflicts of interest were disclosed by the other authors.
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Weide, B., Martens, A., Wistuba-Hamprecht, K. et al. Combined treatment with ipilimumab and intratumoral interleukin-2 in pretreated patients with stage IV melanoma—safety and efficacy in a phase II study. Cancer Immunol Immunother 66, 441–449 (2017). https://doi.org/10.1007/s00262-016-1944-0
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DOI: https://doi.org/10.1007/s00262-016-1944-0