Table 2 Univariate analysis for prognostic factors in overall survival, event free survival and local recurrence free survival

Age

 ≧60 yr

56

80.8%

p = 0.298

64.4%

p = 0.711

87.0%

p = 0.926

 <60 yr

77

84.5%

62.0%

86.5%

Gender

 Male

78

78.7%

p = 0.362

55.4%

p = 0.067

96.3%

p = 0.040 *

 Female

55

86.9%

75.8%

80.5%

Tumor location

 Extremity

108

83.4%

p = 0.271

64.9%

p = 0.874

89.7%

p = 0.075

 Trunk

25

76.6%

58.3%

74.4%

Tumor depth

 Superficial

62

94.2%

p < 0.001*

82.3%

p < 0.001*

95.7%

p < 0.01*

 Deep

71

71.0%

45.7%

77.4%

Tumor size

 ≦5 cm

46

100.0%

p < 0.001*

90.8%

p < 0.001*

100.0%

p < 0.01*

 >5 cm

87

71.6%

48.1%

78.1%

Histological invasion

 Yes

52

69.6%

p = 0.01*

41.3%

p < 0.001*

77.8%

p = 0.025*

 No

81

90.3%

77.5%

92.1%

Adjuvant radiotherapy

 Yes

32

76.5%

p = 0.964

57.1%

p = 0.538

78.7%

p = 0.128

 No

101

84.7%

66.1%

90.1%

Adjuvant chemotherapy

 Yes

28

88.0%

p = 0.596

66.2%

p = 0.952

91.8%

p = 0.625

 No

105

81.3%

63.4%

86.0%