Table 1 Variables and Relative Classes for 277 patients treated with linear sources

Sex

Male

169

61

Female

108

39

Age at diagnosis (yrs)

≤60

174

63

> 60

103

37

Growth pattern

Superficial

81

29

Exophytic

121

44

Invasive

75

27

Site

Side

254

92

Tip

1

0

Lower

20

7

Upper

2

1

Leukoplakia

Absent

67

24

Present

210

76

Tumor thickness (mm)

≤5

106

38

6–10

97

35

11–15

40

14

> 15

34

12

Maximum diameter (mm)

≤30

196

71

> 30

81

29

Brachytherapy source

192Ir hairpin

104

38

226Ra needle

162

58

137Cs needle

11

4

Brachytherapy dose (Gy)

≤70

216

78

> 70

61

22

Brachytherapy plane

Single

242

87

Double

32

12

Volume

3

1

External irradiation

+

45

16

-

232

84