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논문 기본 정보

자료유형
학술저널
저자정보
Gyu Sang Yoo (Departments of Radiation OncologySamsung Medical Center Sungkyunkwan University School of Medicine) Won-Gyun Ahn (Department of Radiation Oncology Samsung Medical Center) Shin-Yeong Kim (Department of Radiation Oncology Samsung Medical Center) Wonseok Kang (Department of Medicine Samsung Medical Center Sungkyunkwan University School of Medicine) Changhoon Choi (Department of Radiation Oncology Samsung Medical Center) Hee Chul Park (Departments of Radiation OncologySamsung Medical Center Sungkyunkwan University School of Medicine)
저널정보
대한간학회 Clinical and Molecular Hepatology Clinical and Molecular Hepatology 제27권 제1호
발행연도
2021.1
수록면
144 - 156 (13page)

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Background/Aims: The abscopal effect, a rare phenomenon induced by radiation, can be reinforced by immunotherapy. Although radiation therapy and immunotherapy are increasingly being utilized for the treatment of hepatocellular carcinoma (HCC), whether immunotherapy could boost the abscopal effect remains unclear. In this study, we aimed to elucidate the immunological mechanisms underlying the abscopal effect induced by the combination of irradiation and immunotherapy in a murine HCC model. Methods: A syngeneic HCC mouse model was established by transplanting murine Hepa 1?6 HCC cells into both hind legs of immunocompetent C57BL/6 mice. The tumors on the right hind legs were irradiated, and abscopal effects were observed in the non-irradiated tumors on the left hind leg with or without the coadministration of anti-programmed cell death 1 (PD-1) antibodies. Flow cytometric analyses were performed to analyze the distributions of immune cells infiltrating both irradiated and non-irradiated tumors and the tumor-draining lymph nodes (TDLNs). Results: Administration of 16 Gy in two fractions more effectively inhibited the growth of both irradiated and nonirradiated tumors with higher tumor infiltration of cytotoxic T cells than 8 Gy did in a single fraction. The higher dose also increased activated dendritic cells in TDLNs, which had higher expression of the programmed cell death ligand 1. Coadministration of anti-PD-1 antibodies significantly enhanced the abscopal effect and increased infiltration of activated cytotoxic T cells in both irradiated and non-irradiated tumors. Conclusions: Our findings show that adding anti-PD-1 therapy to radiation enhanced the abscopal effect in a syngeneic murine model of HCC.

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