Received: 1 February 2022
Accepted: 26 May 2022
First Online: 17 June 2022
: The present study included data from the eTumour project. The eTumour project was approved by the ethical review boards of the participating centers and written informed consent was obtained from all included patients. Ethical review boards (ERBs) of the partners included the ERBs of Universitat Autònoma de Barcelona; Hospital Sant Joan de Déu; University of Birmingham; Fundación Lucha contra las Enfermedades Neurológicas de la Infancia; Cancer Research UK Cambridge Research Institute; Deutsche Krebsforschungzentrum Heidelberg; Medical University of Lodz; St Georges’ Hospital and Medical School; University Medical Centre Nijmegen, Radboud University; University of Nottingham; and Universidad de Valencia. Further details of the eTumour project can be found elsewhere <sup>20</sup>.In addition, the present study also included new post-operative data of different patients. Ethical approval for this part of the study was waived by our institutional review board (CMO region Arnhem-Nijmegen) because of the retrospective study design. All procedures performed were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: All authors consent publication of this manuscript.
: No competing interests.