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Kruger, Stephan; Legenstein, Marie-Louise; Rösgen, Verena; Haas, Michael; Modest, Dominik Paul; Westphalen, Christoph Benedikt; Ormanns, Steffen; Kirchner, Thomas; Heinemann, Volker; Holdenrieder, Stefan; Boeck, Stefan
Oncoimmunology, 05/2017, Volume: 6, Issue: 5Journal Article
Up to now, the efficacy of programmed death protein 1/programmed death ligand 1 (PD-1/PD-L1) blockade in pancreatic cancer (PC) remains uncertain. Serum levels of soluble PD-1 and PD-L1 (sPD-1/sPD-L1) have been reported to be independent prognostic factors in solid tumors susceptible to checkpoint blockade. Provenience, regulation and immunologic function of sPD-1 and sPD-L1 in cancer are poorly understood. To the best of our knowledge, sPD-1 and sPD-L1 have not been measured conjointly in any cancer type yet. In contrast to other tumor entities, sPD-1/sPD-L1 levels did not indicate an adverse outcome in a cohort of 41 patients with advanced PC. We observed a close positive correlation of sPD-L1 levels with sPD-1 in patients with advanced PC, suggesting a common provenience and regulation of sPD-1 and sPD-L1 in cancer patients. Higher sPD-L1 levels were present in patients with elevated C-reactive protein or strong tumoral T cell infiltration, while no correlation of sPD-L1 levels with tumoral PD-L1 expression was found. Our findings indicate that sPD-1 and sPD-L1 are markers of systemic inflammation in (pancreatic) cancer. In a subset of PC patients, elevation in sPD-L1 levels might be caused by an inflammatory tumor type - independent of tumoral PD-L1 expression.
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