Table 3.

Univariate Analysis by the Kaplan‐Meier Method^a

Characteristic	PFS	LRFS	RRFS	DMFS
Sex	0.15	0.059	0.56	0.42
Age (≤50 y vs >50 y)	0.37	0.70	0.38	0.12
Time to disease recurrence (≤2 y vs >2 y)	0.23	0.37	0.30	0.18
T classification (T1/2 vs T3/4)	0.38	0.59	0.50	0.49
N classification (N+ vs N‐)	0.14	0.12	0.56	0.42
Chemotherapyb	0.13	0.43	0.50	0.51
GTV dose (<60 GyE vs ≥60 GyE)	0.19	0.30	0.61	0.37
Fractionation (<3 GyE vs 3 GyE)	0.027	0.058	0.48	0.24
BED (<74.1 GyE vs ≥74.1 GyE)c	0.035	0.10	0.50	0.26

Abbreviations: BED, biological equivalent dose; DMFS, distant metastasis‐free survival, GTV, gross (macroscopic) tumor volume; GyE, Gray equivalent; LRFS, local recurrence‐free survival; PFS, progression‐free survival; RRFS, regional recurrence‐free survival.

^aBold type indicates statistical significance.

^bInduction and/or concurrent chemotherapy.

^cThe median BED was 74.1 GyE.