Twenty-seven patients were treated with RT only. The median age of this cohort was 70.4 years (65.8–85.6). The performance status was worse in this cohort with a median ECOG of 2 (1–3) and less patients received a gross total resection. Patients with mono-RT were more likely to be treated with a hypofractionated schedule with either 2.67 or 3.0 single dose up to a dose of 40.05 or 42 Gy. 2 patients received an adjuvant TMZ based chemotherapy (one patient decided against concomitant RChT, the other patient received hypofractionated treatment with 3 Gy single dose and actively decided to receive further adjuvant treatment). MGMT promotor methylation status was available for 14 patients with positive result in 4 of these cases (28.5%). For the two patients which underwent adjuvant ChT, no MGMT methylation status was available.