Figure 2.

K-M curve of risk factors for tumor control which were filtered by univariate analysis (log-rank test). Tumor located at the optic chiasm/hypothalamus (a), the existence of intratumoral cyst formation (b), tumor volume > 6 ml (c), and marginal dose (BED) ≤ 60.0 Gy (d) provided a lower survival rate of tumor. The results were statistically significant (p value ≤ 0.15).