a near-significant trendp = 0.08
RT to the cerebrum showed a trend toward worse PFS (HR = 1.63, 95% CI: 0.93–2.84, p = 0.09), while RT to the primary tumor site showed a near-significant trend toward improved PFS (HR = 0.6, 95% CI: 0.33–1.06, p = 0.08).