CCDC26 and glioblastoma: Meta-analysis showed a significant association between all genotypes analyzed and increased GBM risk, CCDC26 rs891835 G/T genotype (OR = 1.96; 95% CI: 1.38–2.77; p = 0.0002; I2 = 0%), G/G genotype (OR = 1.33; 95% CI: 0.46–3.85; p = 0.60; I2 = 0%), and G/T–G/G genotype (OR = 1.96; 95% CI: 1.39–2.76; p = 0.0001; I2 = 0%).