Abstract
Effective uptake of tumor cell-derived antigens by antigen-presenting cells is achieved pre-clinically by in situ labeling of tumor with α-gal glycolipids that bind the naturally occurring anti-Gal antibody. We evaluated toxicity and feasibility of intratumoral injections of α-gal glycolipids as an autologous tumor antigen-targeted immunotherapy in melanoma patients (pts). Pts with unresectable metastatic melanoma, at least one cutaneous, subcutaneous, or palpable lymph node metastasis, and serum anti-Gal titer ≥1:50 were eligible for two intratumoral α-gal glycolipid injections given 4 weeks apart (cohort I: 0.1 mg/injection; cohort II: 1.0 mg/injection; cohort III: 10 mg/injection). Monitoring included blood for clinical, autoimmune, and immunological analyses and core tumor biopsies. Treatment outcome was determined 8 weeks after the first α-gal glycolipid injection. Nine pts received two intratumoral injections of α-gal glycolipids (3 pts/cohort). Injection-site toxicity was mild, and no systemic toxicity or autoimmunity could be attributed to the therapy. Two pts had stable disease by RECIST lasting 8 and 7 months. Tumor nodule biopsies revealed minimal to no change in inflammatory infiltrate between pre- and post-treatment biopsies except for 1 pt (cohort III) with a post-treatment inflammatory infiltrate. Two and four weeks post-injection, treated nodules in 5 of 9 pts exhibited tumor cell necrosis without neutrophilic or lymphocytic inflammatory response. Non-treated tumor nodules in 2 of 4 evaluable pts also showed necrosis. Repeated intratumoral injections of α-gal glycolipids are well tolerated, and tumor necrosis was seen in some tumor nodule biopsies after tumor injection with α-gal glycolipids.
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Abbreviations
- ADCC:
-
Antibody-dependent cell-mediated cytotoxicity
- ANA:
-
Antinuclear antibodies
- DLT:
-
Dose-limiting toxicity
- ECOG:
-
Eastern Cooperative Oncology Group
- ESR:
-
Erythrocyte sedimentation rate
- MFI:
-
Median fluorescence intensity
- MTD:
-
Maximum tolerated dose
- PD:
-
Progressive disease
- pt:
-
Patient
- SD:
-
Stable disease
- ULN:
-
Upper limit of normal
- UW:
-
University of Wisconsin
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Acknowledgments
We thank Michael D. Macklin for technical assistance and Laddie Johnson for assistance with manuscript preparation. The authors thank the UW Translational Research Initiatives in Pathology laboratory, in part supported by the UW Department of Pathology and Laboratory Medicine and the UW Carbone Cancer Center, for use of its facilities and services. We also thank the nurses on the UW Clinical Research Unit for outstanding nursing care and for clinical trial support.
Financial support
Support was provided by NIH Grants CA130295, P30 CA014520 from the National Cancer Institute, by resources at the William S. Middleton Memorial Veterans Hospital, Madison, WI, and by the Clinical and Translational Science Award (CTSA) program, through the NIH National Center for Advancing Translational Sciences (NCATS), Grant UL1TR000427. The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH or the views of the Department of Veterans Affairs or the US Government. Additional support was provided by Ann’s Hope Foundation, the Tim Eagle Memorial, the Jay Van Sloan Memorial from the Steve Leuthold Family, the Gretchen and Andrew Dawes Melanoma Research Fund, and Agalimmune.
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The authors have the following financial or other conflicts of interests to disclose related to this publication: Uri Galili is the inventor of this immunotherapy and is a consultant to Agalimmune Inc. which further develops cancer immunotherapy with α-gal glycolipids. All other authors declare no financial or other conflicts of interests related to this publication.
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The UW Human Subjects Committee and the FDA approved this study (IND 12946). Informed consent was obtained from all individual participants included in the study and all individual participants registered with the Biostatistics Registration Desk prior to treatment. The clinical trial registration number for this study is: NCT00668512. All procedures performed in studies involving human participants were in accordance with ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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Albertini, M.R., Ranheim, E.A., Zuleger, C.L. et al. Phase I study to evaluate toxicity and feasibility of intratumoral injection of α-gal glycolipids in patients with advanced melanoma. Cancer Immunol Immunother 65, 897–907 (2016). https://doi.org/10.1007/s00262-016-1846-1
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DOI: https://doi.org/10.1007/s00262-016-1846-1