Tumor microenvironment-derived S100A8/A9 is a novel prognostic biomarker for advanced melanoma patients and during immunotherapy with anti-PD-1 antibodies ========================================================================================================================================================== * Nikolaus B. Wagner * Benjamin Weide * Mirko Gries * Maike Reith * Kathrin Tarnanidis * Valerie Schuermans * Charlotte Kemper * Coretta Kehrel * Anne Funder * Ramtin Lichtenberger * Antje Sucker * Esther Herpel * Tim Holland-Letz * Dirk Schadendorf * Claus Garbe * Viktor Umansky * Jochen Utikal * Christoffer Gebhardt