ESTRO 2024 - Abstract Book

S839

Clinical - CNS

ESTRO 2024

Left

occipital

5 3 2 1

Left

parietal

Bilateral frontal

Dose Re-irradiation

36 GyRBE (18 fractions

Median time between First Radiotherapy and re-PT

29 months [4-228]

Concomitant

Temodal

5 2

Concomitant Avastin

-

37,23

cc

(range

0,26-

166,81)

Median

GTV

volume

-

78

cc

(range,

12-259)

Median

CTV

volume

- 124 cc (range 18,55-345,52)

Median PTV volume

Isocitrate dehydrogenases (IDH) mutation

Wild Type: 27 (51 %) patients Mutant: 17 (32 %) patients Unknown: 9 (17 %) patients

O6 -MeG)-DNA methyltransferase (MGMT) status Unknown: 14 (26%) patients -methylguanine (O6

Methylated:

21

(40

%)

patients

Unmethylated:

18

(34

%)

patients

Steroid use before re-PT

Yes: 28 (53 %) patients No: 25 (47 %) patients

Table 1:Patient characteristics