Table 3 Univariate analysis of prognostic factors for OS and DFS

Gender

Male

73.6

73.9

Female

86.0

72.4

p=0.276

p=0.50

Age

≤45 years

80.5

72.1

>45 years

70.7

75.3

p=0.042

p=0.848

Time interval from

first radiotherapy

≤2 months

78.5

74.7

>2 months

49.7

59.3

p=0.40

p=0.925

T stage at diagnosis

T1-2

83.9

86.2

T3-4

70.1

63.6

p=0.039

p=0.039

N stage at diagnosis

N0-1

80.8

75.2

N2-3

71.1

71.6

p=0.195

p=0.805

Tumor volume

≤10cc

81.3

78.5

>10cc

73.7

70.6

p=0.173

p=0.260

BED

≤30 Gy

80.3

73.8

>30 Gy

68.9

72.9

p=0.415

p=0.968

Chemotherapy in primary RT

no

78.7

75.0

yes

61.3

67.2

p=0.316

p=0.317