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Representative tissue from first surgery is preferred, but tissue from surgery for recurrence is allowed. Exception: only tissue from first surgery is allowed for Cohort 16.\n* Available MRI\u002FCT scans from primary brain tumour at initial diagnosis\n* Patient's consent\n\nDeceased patient:\n\nThe clinical data and\u002For biological material and\u002For CT\u002FMRI\u002FPET images can be accessed and used if at least one of the following three conditions is met:\n\n* The patient agreed beforehand in his\u002Fher lifetime to a further use of his\u002Fher data and\u002For biological material and\u002For CT\u002FMRI\u002FPET images, or,\n* There is consent of a relative to use data and\u002For biological material and\u002For CT\u002FMRI\u002FPET images of the deceased patient, or,\n* There is a reference to a corresponding legal declaration covering the exemption in case of the impossibility or disproportion of getting access to an informed consent (e.g., causing strain on relatives of deceased patients).\n\nAdditionally, in all cases the following three points need to be fulfilled:\n\n* No documentation of previous objection of the patient to the (re-)use of their data, biological material, CT\u002FMR\u002FPET images for research purposes\n* A notification to an ethics committee for the re-use of these data, biological material and CT\u002FMRI\u002FPET images\n* Any other national requirements are fulfilled, if applicable","ALL","18 Years",{"count":438,"type":439},1650,"ESTIMATED","10 Years","OBSERVATIONAL","Every new classification depends on its prognostic power and on the type of treatment given. 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