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. 2020 Nov 12;5(6):e000863. doi: 10.1136/esmoopen-2020-000863

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© Author (s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. Published by BMJ on behalf of the European Society for Medical Oncology.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, any changes made are indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Soluble programmed death receptor ligand 1 (sPD-L1) detectability in (A) the overall cohort according to histology; patients with (B) glioma and (C) meningioma according to WHO grade; (D) patients with brain metastasis according to the primary tumour. The lower limit of sPD-L1 detectability was 0.05 ng/mL.