Table 1.
Characteristics of the 44 Patients With Recurrent and Refractory HGM
| Age, years | Mean, SD | 59.5 | 12.3 |
| Median, range | 62.5 | 29–79 | |
| n | % | ||
| Sex | Female | 29 | 65.9% |
| Male | 15 | 34.1% | |
| Histology | WHO 2 | 20 | 45.5% |
| WHO 3 | 24 | 54.5% | |
| Location | Convexity | 14 | 31.8% |
| Falx/parasagittal | 17 | 38.6% | |
| Skull base | 13 | 29.5% | |
| KPS | ≥80 | 32 | 72.7% |
| 60≤, <80 | 12 | 27.3% | |
| Previous operation | n | % | |
| Total | 114 | 100% | |
| No. of times | |||
| Mean, SD | 2.9 | 1.4 | |
| Previous radiotherapy | n | % | |
| Total | 40 | 90.9% | |
| No. of times | |||
| EBRT | Mean, SD | 0.23 | 0.42 |
| SRS + SRT | 1.75 | 1.64 | |
| Tumor volume at BNCT, ml | Mean, SD | 42.7 | 52.9 |
| Median, range | 24.5 | 1.5–299.2 |
Abbreviations: BNCT = boron neutron capture therapy; EBRT = external beam fractionated radiotherapy; HGM = High-grade meningioma; KPS = Karnofsky Performance Status; SRS = stereotactic radiosurgery; SRT = stereotactic radiotherapy, WHO = World Health Organization.