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Releasing the brakes of tumor immunity with anti-PD-L1 and pushing its accelerator with L19-IL2 cures poorly immunogenic tumors when combined with radiotherapy.

Veronica Olivo Pimentel | Damiƫnne Marcus | Alexander Ma van der Wiel | Natasja G Lieuwes | Rianne Biemans | Relinde Iy Lieverse | Dario Neri | Jan Theys | Ala Yaromina | Ludwig J Dubois | Philippe Lambin
Journal for immunotherapy of cancer | 2021

Poorly immunogenic tumors are hardly responsive to immunotherapies such as immune checkpoint blockade (ICB) and are, therefore, a therapeutic challenge. Combination with other immunotherapies and/or immunogenic therapies, such as radiotherapy (RT), could make these tumors more immune responsive. We have previously shown that the immunocytokine L19-IL2 combined with single-dose RT resulted in 75% tumor remission and a 20% curative abscopal effect in the T cell-inflamed C51 colon carcinoma model. This treatment schedule was associated with the upregulation of inhibitory immune checkpoint (IC) molecules on tumor-infiltrating T cells, leading to only tumor growth delay in the poorly immunogenic Lewis lung carcinoma (LLC) model.

Pubmed ID: 33688020

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