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Moon HG, Son HY, Heo WH, Quan M, LI SONGBIN, Valentina H, Jeong H, Han W, Lee HB, HER YUJEONG, Kim JH. Abstract P2-20-05: Personalized tumor vaccine can suppress tumor growth and metastasis in the syngeneic mouse breast cancer model. Cancer Res 2023. [DOI: 10.1158/1538-7445.sabcs22-p2-20-05] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
Abstract
Abstract
Objective Immunotherapy using the tumor-specific antigens (TSAs) is a promising strategy in breast cancer. Studies have suggested that the in vivo exposures to certain tumors can induce adaptive anti-tumor immunity in syngeneic tumor models. In this study, we show the efficacy of the tumor lysate vaccine and peptide-based vaccine against tumor neoantigen in suppressing tumor growth and metastasis in 4T1 syngeneic tumor models. Method We used BALB/c mice and its syngeneic tumor cell lines to evaluate the anti-tumor effect induced by the transient exposure to the tumor cells. For tumor vaccines, we synthesized the tumor lysate vaccine by the freeze-thaw method or synthetic peptide against the selected tumor neoantigens identified by exome sequencing. We systemic and local immune remodeling was investigated by using immunohistochemistry, flow cytometry, and single cell RNA sequencing. Results We observed a significant reduction of tumor growth and metastasis in 4T1 syngeneic tumors when the mice were previously exposed to the same cells (pre-exposure group). This anti-tumor effect induced by the exposures to the tumor was cell line-specific. The 4T1 tumor lysate vaccines administered prior to the tumor cell injection also showed significant inhibitory effect on tumor growth and metastasis. T lymphocytes, isolated from the tumor tissues of the 4T1 pre-exposure mice and lysate vaccine-treated mice, showed higher levels of TNF-ɑ and IFN-ɣ when compared to the control those from the control tumors. The lysate vaccine treatment resulted in a substantial remodeling of tumor microenvironment including reduction of myeloid-derived suppressor cells and M2 tumor-associated macrophages. On the other hand, the numbers of M1 tumor-associated macrophages and effector memory CD8+ T cells were increased by the lysate vaccine. While the peptide vaccine showed no inhibitory effect on the primary tumor growth, it also suppressed spontaneous lung metastasis. Finally, we administered lysate tumor vaccine after the tumor establishment to determine the therapeutic effect. The lysate vaccine significantly suppressed the tumor growth and lung metastasis of the syngeneic 4T1 tumors. Conclusion Tumor lysate vaccine can suppress the tumor growth and metastasis in the 4T1 syngeneic mouse models by inducing substantial remodeling of tumor immune microenvironment. Additionally, tumor lysate vaccine can elicit similar anti-tumor immune response when administered after the establishment of the primary tumor suggesting a potential therapeutic value.
Citation Format: Hyeong-Gon Moon, Hye Youn Son, Woo Hang Heo, Mingji Quan, SONGBIN LI, Haritonova Valentina, Hamin Jeong, Wonshik Han, Han-Byoel Lee, YUJEONG HER, Ju Hee Kim. Personalized tumor vaccine can suppress tumor growth and metastasis in the syngeneic mouse breast cancer model [abstract]. In: Proceedings of the 2022 San Antonio Breast Cancer Symposium; 2022 Dec 6-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2023;83(5 Suppl):Abstract nr P2-20-05.
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Affiliation(s)
| | - Hye Youn Son
- 2Seoul National University Hospital, Republic of Korea
| | | | - Mingji Quan
- 4Seoul National University, Republic of Korea
| | - SONGBIN LI
- 5Seoul National University, Republic of Korea
| | | | - Hamin Jeong
- 7Seoul National University, Republic of Korea
| | - Wonshik Han
- 8Seoul National University Hospital, Seoul, Republic of Korea
| | | | - YUJEONG HER
- 10Seoul National University, Republic of Korea
| | - Ju Hee Kim
- 11Seoul National University Hospital, Republic of Korea
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Heo WH, Lee W, LI SONGBIN, Kim JI, Moon HG. Abstract P2-21-06: The relationship between the gene expression difference of fibroblasts in the tumor microenvironment and metastasis of triple-negative breast cancer. Cancer Res 2023. [DOI: 10.1158/1538-7445.sabcs22-p2-21-06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
Abstract
Abstract
Background Triple negative breast cancer (TNBC) is a breast cancer subtype with increased risk of distant metastasis, especially to lung and liver. In addition to the intrinsic characteristics of tumor cells, the molecular features of the tumor microenvironment cells can also regulate the metastasis process of TNBC. In this study, we tried to characterize the transcriptomic features of microenvironment fibroblasts associated with the distant metastasis of TNBC. Method We established PDX models by obtaining tumor tissues from 26 triple-negative breast cancer patients and transplanting them into the mammary fat pads of immunodeficient mice. When the PDX tumors grew sufficiently in the fat pads, we excised them and saved the mice to assess whether each PDX tumor was capable of developing spontaneous distant metastasis. We used bulk RNA sequencing and single cell RNA sequencing to determine the transcriptomic features associated with the distant metastasis. Results We classified the 26 TNBC PDX models based on their in vivo metastasis capacity and the clinical outcomes of the corresponding patients. Non-metastatic PDX models were defined as the lack of developing distant metastasis in either mouse experiment or clinical follow-up data (n=5). PDX models were defined as metastatic models when they developed distant metastasis in both mouse and human (n=4). We performed single cell RNA sequencing using the nine PDX tumors and observed a substantial gene expression differences of fibroblasts in the tumor microenvironment between the metastatic and non-metastatic PDX models. The fibroblasts of the metastatic PDX models showed up-regulation of genes involved in the response to hypoxia, inflammatory response, neutrophil chemotaxis, cellular response to IL-1, positive regulation of cell proliferation, and negative regulation of apoptotic process. Moreover, this difference of gene expression between metastatic and non-metastatic TNBC PDX models were not identified by the bulk RNA sequencing data. Conclusion By using the single cell RNA sequencing using the TNBC PDX models, we identified key features of fibroblasts in the tumor microenvironment that contributes to the metastasis capacity of TNBC. Further studies are on-going to elucidate the underlying mechanisms.
Citation Format: Woo Hang Heo, Woochan Lee, SONGBIN LI, Jong-Il Kim, Hyeong-Gon Moon. The relationship between the gene expression difference of fibroblasts in the tumor microenvironment and metastasis of triple-negative breast cancer [abstract]. In: Proceedings of the 2022 San Antonio Breast Cancer Symposium; 2022 Dec 6-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2023;83(5 Suppl):Abstract nr P2-21-06.
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Affiliation(s)
| | | | - SONGBIN LI
- 3Seoul National University, Republic of Korea
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