Abstract
Background
Ipilimumab can induce durable disease control and long-term survival in patients with metastatic melanoma. Identification of a biomarker that correlates with clinical benefit and potentially provides an early marker of response is an active area of research.
Patients and methods
Ipilimumab was available upon physician request for patients aged ≥16 years with stage III (unresectable) or IV cutaneous, ocular or mucosal melanoma, who had failed or did not tolerate previous treatments and had no other therapeutic option available. Patients received ipilimumab 3 mg/kg every 3 weeks for four doses. Tumour assessments were conducted at baseline, Week 12 and Week 24 using immune-related response criteria. Patients were monitored continuously for adverse events (AEs), including immune-related AEs. Candidate immunological markers were evaluated in peripheral blood and sera samples collected at baseline and Weeks 4, 7, 10 and 12.
Results
Among 95 patients treated with ipilimumab 3 mg/kg, the immune-related disease control rate at Week 24 was 38 %. With a median follow-up of 24 months, median overall survival was 9.6 months. Both disease control and survival were significantly associated with decreasing levels of lactate dehydrogenase, C-reactive protein and FoxP3/regulatory T cells, and increasing absolute lymphocyte count, between baseline and the end of dosing (Week 12).
Conclusion
Ipilimumab is a feasible treatment option for heavily pretreated patients with metastatic melanoma. Changes in some immunological markers between baseline and the fourth ipilimumab infusion appear to be associated with disease control and survival, but verification in prospective clinical trials is required.
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Abbreviations
- AE:
-
Adverse event
- ALC:
-
Absolute lymphocyte count
- BORR:
-
Best overall response rate
- CI:
-
Confidence interval
- CR:
-
Complete response
- CRP:
-
C-reactive protein
- CTLA-4:
-
Cytotoxic T-lymphocyte-associated antigen-4
- DCR:
-
Disease control rate
- EAP:
-
Expanded access programme
- ECOG:
-
Eastern Cooperative Oncology Group
- FACS:
-
Fluorescence-activated cell sorting
- ir:
-
Immune-related
- irRC:
-
Immune-related response criteria
- LDH:
-
Lactate dehydrogenase
- OS:
-
Overall survival
- PD:
-
Progressive disease
- PBMC:
-
Peripheral blood mononuclear cell
- PR:
-
Partial response
- PS:
-
Performance status
- SD:
-
Stable disease
- Tregs:
-
Regulatory T cells
- ULN:
-
Upper limit of normal
- WBC:
-
White blood cell
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Acknowledgments
This work was supported in part by the Italian Ministry of Health, via the Ricerca Corrente 2010. The authors would like to thank the patients and investigators who participated in the European EAP. The EAP was sponsored by Bristol-Myers Squibb. Editorial and writing assistance was provided by StemScientific, funded by Bristol-Myers Squibb (BMS).
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Simeone, E., Gentilcore, G., Giannarelli, D. et al. Immunological and biological changes during ipilimumab treatment and their potential correlation with clinical response and survival in patients with advanced melanoma. Cancer Immunol Immunother 63, 675–683 (2014). https://doi.org/10.1007/s00262-014-1545-8
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DOI: https://doi.org/10.1007/s00262-014-1545-8