Extracellular HMGB1 blockade inhibits tumor growth through profoundly remodeling immune microenvironment and enhances checkpoint inhibitor-based immunotherapy by Coraline Radermecker, Pascale Hubert, Patrick Roncarati, Stephanie Demoulin, Charlotte Pilard, Marie Ancion, Celia Reynders, Thomas Lerho, Diane Bruyere, Alizee Lebeau, Margot Meunier, Marie-Julie Nokin, Elodie Hendrick, Olivier Peulen, Philippe Delvenne, Michael Herfs

“…We also reported that a significant fraction of HMGB1 encountered within cancer microenvironment (interstitial fluids) is oxidized and, in opposite to its reduced isoform, oxidized HMGB1 acts as a tolerogenic signal in a receptor for advanced glycation endproducts-dependent manner.Conclusion Collectively, we present evidence that extracellular HMGB1 blockade may complement first-generation cancer immunotherapies by remobilizing antitumor immune response.…”
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Comparison of PD-L1 tumor cell expression with 22C3, 28-8, and SP142 IHC assays across multiple tumor types by Jeffrey S Ross, Richard S P Huang, Jake G Maule, Lani K Clinton, Ryon P Graf, Jinpeng Xiao, Geoffrey R Oxnard

“…Background Multiple PD-L1 immunohistochemistry (IHC) assays, including DAKO 22C3, DAKO 28-8, and Ventana SP142 PD-L1 IHC assays, have been approved by the Food and Drug Administration as a companion diagnostic (CDx) for various antiprogrammed death-1 and antiprogrammed death ligand 1 (PD-L1) based cancer immunotherapies. Here we present 22C3, 28-8, and SP142 analysis of 418 tumor specimens encountered in routine clinical practice.Methods All specimens were tested with 22C3, 28-8, and SP142 assays following the manufacturer’s established staining protocols.Results The same PD-L1 status (defined as tumor cell expression (TC) scores with all three assays ≥1% or all <1%) was observed in 60.0% (251/418) tumor specimens (45.9% (192/418) were triple negative and 14.1% (59/418) were triple positive). …”
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