Received: 3 January 2020
Accepted: 24 April 2020
First Online: 6 May 2020
Ethics approval and consent to participate
: The study followed the Declaration of Helsinki and was approved by the local ethical committee of the Technical University of Munich (vote 5625–12).
: The present work is based on a retrospective analysis of clinical data.
: Christoph Straube: received a scholarship from Medac GmbH; received a travel grant from NovoCure Ltd.; contributed to a brochure for patients about GBM which was partially sponsored by NovoCure Ltd. Received Speakers Honoria from Teva Pharmaceutical Industries Ltd. and Roche.Jens Gempt and Bernhard Meyer: work as consultants for BrainLab. contributed to a brochure for patients about GBM which was partially sponsored by NovoCure Ltd.Stephanie E. Combs: has served on Advisory Board of Bristol-Myers-Squibb (BMS), Roche, Novocure, Daiichi Synkio, Astra Zeneca, Icotec; Advisory board and Speaker’s Bureau for BrainLab; Advisory Board of Roche, Daiichi Sankyo and Varian Medical Systems. Has received Speakers Honoraria from BrainLab, Accuray, Dr. Sennewald, BMS, Astra Zeneca, Roche, Varian Medical Systems, Icotec, Elekta, Novocure and Medac GmbH.Friederike Schmidt-Graf served as an author for Medac GmbH and received travel grants from medac, contributed to a brochure for patients about GBM which was partially sponsored by NovoCure Ltd.Stefanie Antoni has nothing to declare.