Tumor-associated antigen-based personalized dendritic cell vaccine in solid tumor patients

Tumor-associated antigens (TAAs) have been tested in various clinical trials in cancer treatment but the patterns of specific T cell response to personalized TAA immunization remains to be fully understood. We report antigen-specific T cell responses in patients immunized with dendritic cell vaccine...

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Published in:	Cancer Immunology, Immunotherapy Immunotherapy, 2020-07, Vol.69 (7), p.1375-1387
Main Authors:	Wang, Qian-Ting, Nie, Ying, Sun, Sheng-Nan, Lin, Tao, Han, Ru-Jin, Jiang, Jun, Li, Zhe, Li, Jun-Qi, Xiao, Yun-Peng, Fan, Yu-Ying, Yuan, Xiao-Hui, Zhang, Hui, Zhao, Bin-Bin, Zeng, Ming, Li, Shi-You, Liao, Hua-Xin, Zhang, Jian, He, You-Wen
Format:	Article
Language:	eng
Subjects:	Adolescent Adult Aged Antigen (tumor-associated) Antigens Antigens, Neoplasm - immunology Biomarkers, Tumor - genetics Brain cancer Cancer Research Cancer vaccines Cancer Vaccines - immunology Cancer Vaccines - therapeutic use Carcinoma, Non-Small-Cell Lung - immunology Carcinoma, Non-Small-Cell Lung - pathology Carcinoma, Non-Small-Cell Lung - therapy CD4 antigen CD4-Positive T-Lymphocytes - immunology CD8 antigen CD8-Positive T-Lymphocytes - immunology Cell survival Clinical Trial Report Clinical trials Cyclophosphamide Dendritic cells Dendritic Cells - immunology Female Follow-Up Studies Gene Expression Profiling Gene Expression Regulation, Neoplastic Glioblastoma Glioblastoma - immunology Glioblastoma - pathology Glioblastoma - therapy Humans Imiquimod Immunization Immunology Lung cancer Lung Neoplasms - immunology Lung Neoplasms - pathology Lung Neoplasms - therapy Lymphocytes Lymphocytes T Male Medicine Medicine & Public Health Middle Aged NCT NCT02709616 NCT02808364 NCT02808416 Oncology Patients PD-1 protein Polyinosinic:polycytidylic acid Precision Medicine Prognosis Solid tumors Survival Rate Vaccines
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Summary:	Tumor-associated antigens (TAAs) have been tested in various clinical trials in cancer treatment but the patterns of specific T cell response to personalized TAA immunization remains to be fully understood. We report antigen-specific T cell responses in patients immunized with dendritic cell vaccines pulsed with personalized TAA panels. Tumor samples from patients were first analyzed to identify overexpressed TAAs. Autologous DCs were then transfected with pre-manufactured mRNAs encoding the full-length TAAs, overexpressed in the patients' tumors. Patients with glioblastoma multiforme (GBM) or advanced lung cancer received DC vaccines transfected with personalized TAA panels, in combination with low-dose cyclophosphamide, poly I:C, imiquimod and anti-PD-1 antibody. Antigen-specific T cell responses were measured. Safety and efficacy were evaluated. A total of ten patients were treated with DC vaccines transfected with personalized TAA panels containing 3–13 different TAAs. Among the seven patients tested for anti-TAA T cell responses, most of the TAAs induced antigen-specific CD4 + and/or CD8 + T cell responses, regardless of their expression levels in the tumor tissues. No Grade III/IV adverse events were observed among these patients. Furthermore, the treated patients were associated with favorable overall survival when compared to patients who received standard treatment in the same institution. Personalized TAA immunization-induced-specific CD4 + and CD8 + T cell responses without obvious autoimmune adverse events and was associated with favorable overall survival. These results support further studies on DC immunization with personalized TAA panels for combined immunotherapeutic regimens in solid tumor patients. Trial registration ClinicalTrials.gov, NCT02709616 (March, 2016), NCT02808364 (June 2016), NCT02808416 (June, 2016).
ISSN:	0340-7004 1432-0851