Erratum to: J Neurooncol (2014) 116:505–513 DOI 10.1007/s11060-013-1348-3

In the original publication, the statement in the last two sentences of the 2nd paragraph in the Discussion section should have read as follows:

“In a recent study, it has been suggested that 5-ALA does not affect the isolation and propagation of GBM initiating cells [28]. However, in our opinion, although authors compared stem cell features of 5-ALA+ and 5-ALA cells derived from the same tumour, their analysis is restricted to a limited number of samples [28].”

In addition, there was an error in the title of the original publication. The word 'trough' should have read 'through'.