An oncolytic herpes simplex virus engineered to replicate selectively in tumor cells and to express granulocyte–macrophage colony-stimulating factor (GM-CSF) was tested as a direct intralesional vaccination in melanoma patients. The work reported herein was performed to better characterize the effect of vaccination on local and distant antitumor immunity.
Metastatic melanoma patients with accessible lesions were enrolled in a multicenter 50-patient phase II clinical trial of an oncolytic herpesvirus encoding GM-CSF (OncovexGM-CSF). An initial priming dose of 106 pfu vaccine was given by intratumoral injection, followed by 108 pfu every 2 weeks to 24 total doses. Peripheral blood and tumor tissue were collected for analysis of effector T cells, CD4+FoxP3+ regulatory T cells (Treg), CD8+FoxP3+ suppressor T cells (Ts), and myeloid-derived suppressive cells (MDSC).
Phenotypic analysis of T cells derived from tumor samples suggested distinct differences from peripheral blood T cells. There was an increase in melanoma-associated antigen recognized by T cells (MART-1)-specific T cells in tumors undergoing regression after vaccination compared with T cells derived from melanoma patients not treated with vaccine. There was also a significant decrease in Treg and Ts cells in injected lesions compared with noninjected lesions in the same and different melanoma patients. Similarly MDSC were increased in melanoma lesions but underwent a significant decrease only in vaccinated lesions.
Melanoma patients present with elevated levels of Tregs, Ts, and MDSC within established tumors. Direct injection of OncovexGM-CSF induces local and systemic antigen-specific T cell responses and decreases Treg, Ts, and MDSC in patients exhibiting therapeutic responses.
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Rob Coffin is employed by and has stock options in Biovex, Inc. the manufacturer of the vaccine used in this manuscript.
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Kaufman, H.L., Kim, D.W., DeRaffele, G. et al. Local and Distant Immunity Induced by Intralesional Vaccination with an Oncolytic Herpes Virus Encoding GM-CSF in Patients with Stage IIIc and IV Melanoma. Ann Surg Oncol 17, 718–730 (2010). https://doi.org/10.1245/s10434-009-0809-6
- Peripheral Blood Mononuclear Cell
- Tumor Microenvironment
- Melanoma Patient
- FoxP3 Expression