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LPFS curves in the IMRT and 2D-CRT groups. The LPFS rates were assessed using Kaplan-Meier and Log-Rank analyses. The LPFS rates in the two groups were significantly different [χ2=13.26; P<0.01; IMRT 95% confidence interval (CI), 59.71–82.94 months; 2D-CRT 95% CI, 22.23–45.40 months]. IMRT, intensity-modulated radiotherapy; 2D-CRT, two-dimensional conventional radiotherapy; LPFS, local progression-free survival.
