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K-M curve of risk factors of VA deterioration which were filtered by univariate analysis (log-rank test). Existence of intratumoral cyst formation (a), baseline VA ≤ 0.4 (b), tumor volume > 3 ml (c), and marginal dose (BED) ≥ 70.0 Gy (d) provided a lower survival rate of VA deterioration. The results were statistically significant (p value ≤ 0.15).
