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Elia, Angela Rita; Grioni, Matteo; Basso, Veronica; Curnis, Flavio; Freschi, Massimo; Corti, Angelo; Mondino, Anna; Bellone, Matteo
Clinical cancer research, 05/2018, Letnik: 24, Številka: 9Journal Article
Irregular blood flow and endothelial cell anergy, which characterize many solid tumors, hinder tumor infiltration by cytotoxic T lymphocytes (CTL). This confers resistance to cancer immunotherapy with monoclonal antibodies directed against regulatory pathways in T lymphocytes (i.e., immune checkpoint blockade, ICB). We investigated whether NGR-TNF, a TNF derivative capable of targeting the tumor vasculature, and improving intratumor infiltration by activated CTLs, could sensitize tumors to ICB with antibodies specific for the PD-1 and CTLA-4 receptors. Transgenic adenocarcinoma of the mouse prostate (TRAMP) mice with autochthonous prostate cancer and C57BL/6 mice with orthotopic B16 melanoma were treated with NGR-TNF, adoptive T-cell therapy (ACT), and ICB, and monitored for immune surveillance and disease progression. The combination of ACT, NGR-TNF, and ICB was the most effective in delaying disease progression, and in improving overall survival of mice bearing ICB-resistant prostate cancer or melanoma. Mechanistically, the therapeutic effects were associated with potent tumor infiltration, especially by endogenous but also by adoptively transferred PD-1 , granzyme B , and interferon-γ CTLs. The therapeutic effects were also associated with favorable T-effector/regulatory T cell ratios. Targeting the tumor vasculature with low-dose TNF in association with ACT may represent a novel strategy for enhancing T-cell infiltration in tumors and overcoming resistance to immune checkpoint blockers. .
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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Vir: Osebne bibliografije
in: SICRIS
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