Table 2. Clinical characteristics of glioblastoma patients (n=76).

Variables	n (%)
Age (years)
<50	26 (34.2)
≥50	50 (65.8)
Sex
Male	49 (64.5)
Female	27 (35.5)
Extent of surgery
Biopsy	8 (10.5)
Subtotal resection	32 (42.1)
Gross total resection	36 (47.4)
RPA class
III	19 (25.0)
IV	42 (55.3)
V	15 (19.7)
Methylation status of MGMT gene promoter
Methylated	47 (61.8)
Unmethylated	29 (38.2)
Postoperative adjuvant therapy
Nitrosurea-based combination chemotherapy	33 (43.4)
Concurrent chemoradiotherapy with temozolomide	43 (56.6)

MGMT, O6-methyl guanine DNA methyltransferase; RPA, recursive partitioning analysis