No significant differences were found between groups in age (<i>p</i> = 0.684), residual tumor volume after initial (<i>p</i> = 0.988) or recurrence surgery (<i>p</i> = 0.356), MGMT status (<i>p</i> = 0.766) and KPS post 1st-line-therapy (<i>p</i> = 0.833). Here, MGMT is linked to neoplasm.