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Table 5 Impact of prognostic factors on treatment results by multivariate analysis (p value)

From: Long-term survival and late complications of intensity-modulated radiotherapy for recurrent nasopharyngeal carcinoma

Factors LRFS DMFS OS
Age (years)
 < 60 vs. ≥60 0.970 0.106
rT stage
 rT1–2 vs. rT3–4 0.918 0.463 0.315
FD (Gy)
 ≤ 2 vs. > 2 0.137 0.686
Use of Chem
 No vs. Yes 0.610 0.009 0.342
TTR (years)
 ≤ 2 vs. > 2 0.964 0.041
IMRT dose (Gy)
 < 70 vs. ≥70 0.575
Cumulative dose (Gy)
 < 140 vs. ≥140 0.117 0.112
Brachytherapy
 No vs. Yes 0.051
  1. Abbreviations: LRFS, local recurrence–free survival; DMFS, distant metastases–free survival; OS, overall survival; FD, Fractional dose; Chem, chemotherapy; TTR, time to recurrence