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OS curves in the IMRT and 2D-CRT groups. The OS rates were assessed using the Kaplan-Meier and log-rank analyses. The OS rates in the two groups were signifcantly different [χ2=6.89; P=0.01; IMRT 95% confidential interval (CI), 49.87–74.02 months; 2D-CRT 95% CI, 30.67–45.82 months]. IMRT, intensity-modulated radiotherapy; 2D-CRT, two-dimensional conventional radiotherapy; OS, overall survival.
