Erratum to: J Neurooncol (2008) 89:339–357 DOI 10.1007/s11060-008-9615-4

In Table 3 (p. 353) of the original publication, survival data for the glioblastoma subgroups of the Westphal et al. (Neuro Oncol, 2003) and Valtonen et al. (Neurosurgery, 1997) studies refer to “mean” survival. These data are actually “median” survival. In the text, the data are correctly presented as “median” survival (see p. 352 of the original publication).