American Association for Cancer Research
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Figure S1 from B7-H3 Negatively Modulates CTL-Mediated Cancer Immunity

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journal contribution
posted on 2023-03-31, 19:44 authored by Kimio Yonesaka, Koji Haratani, Shiki Takamura, Hitomi Sakai, Ryoji Kato, Naoki Takegawa, Takayuki Takahama, Kaoru Tanaka, Hidetoshi Hayashi, Masayuki Takeda, Sigeki Kato, Osamu Maenishi, Kazuko Sakai, Yasutaka Chiba, Takafumi Okabe, Keita Kudo, Yoshikazu Hasegawa, Hiroyasu Kaneda, Michiko Yamato, Kenji Hirotani, Masaaki Miyazawa, Kazuto Nishio, Kazuhiko Nakagawa

The B7-H3 staining pattern for diagnosis


Department of Medical Oncology

Kindai University Faculty of Medicine

Shinji Kurashimo at the Central Research Facilities



Purpose: Anti-programmed-death-1 (PD-1) immunotherapy improves survival in non–small cell lung cancer (NSCLC), but some cases are refractory to treatment, thereby requiring alternative strategies. B7-H3, an immune-checkpoint molecule, is expressed in various malignancies. To our knowledge, this study is the first to evaluate B7-H3 expression in NSCLCs treated with anti-PD-1 therapy and the therapeutic potential of a combination of anti-PD-1 therapy and B7-H3 targeting.Experimental Design: B7-H3 expression was evaluated immunohistochemically in patients with NSCLC (n = 82), and its relationship with responsiveness to anti-PD-1 therapy and CD8+ tumor-infiltrating lymphocytes (TILs) was analyzed. The antitumor efficacy of dual anti-B7-H3 and anti-programmed death ligand-1 (PD-L1) antibody therapy was evaluated using a syngeneic murine cancer model. T-cell numbers and functions were analyzed by flow cytometry.Results: B7-H3 expression was evident in 74% of NSCLCs and was correlated critically with nonresponsiveness to anti-PD-1 immunotherapy. A small number of CD8+ TILs was observed as a subpopulation with PD-L1 tumor proportion score less than 50%, whereas CD8+ TILs were still abundant in tumors not expressing B7-H3. Anti-B7-H3 blockade showed antitumor efficacy accompanied with an increased number of CD8+ TILs and recovery of effector function. CD8+ T-cell depletion negated antitumor efficacy induced by B7-H3 blockade, indicating that improved antitumor immunity is mediated by CD8+ T cells. Compared with a single blocking antibody, dual blockade of B7-H3 and PD-L1 enhanced the antitumor reaction.Conclusions: B7-H3 expressed on tumor cells potentially circumvents CD8+-T-cell–mediated immune surveillance. Anti-B7-H3 immunotherapy combined with anti-PD-1/PD-L1 antibody therapy is a promising approach for B7-H3–expressing NSCLCs. Clin Cancer Res; 24(11); 2653–64. ©2018 AACR.