Dead % Not-dead % All %
Age group            
20-49 7 15.6 41 18.7 48 18.2
50-64 16 35.6 67 30.6 83 31.4
65-74 9 20.0 49 22.4 58 22.0
75+ 13 28.9 62 28.3 75 28.4
Sex            
Male 26 57.8 110 50.2 136 51.5
Female 19 42.2 109 49.8 128 48.5
Year of diagnosis            
1996-1999 23 51.1 92 42.0 115 43.6
2000-2003 22 48.9 127 58.0 149 56.4
Tumor thickness1            
0-0.99 mm 5 11.4 42 24.6 47 21.9
1-1.99 mm 4 9.1 51 29.8 55 25.6
2-2.99 mm 7 15.9 24 14.0 31 14.4
3-3.99 mm 6 13.6 13 7.6 19 8.8
4+ mm 19 43.2 29 17.0 48 22.3
Missing data 3 6.8 12 7.0 15 7.0
Clark level            
I 1 2.2 56 25.6 57 21.6
II 1 2.2 30 13.7 31 11.7
III 14 31.1 63 28.8 77 29.2
IV 20 44.4 56 25.6 76 28.8
V 7 15.6 9 4.1 16 6.1
Missing data 2 4.4 5 2.3 7 2.7
Ulceration            
No ulceration 14 31.1 125 57.1 139 52.7
Ulceration 27 60.0 43 19.6 70 26.5
Missing data 4 8.9 51 23.3 55 20.8
Histopathology            
NM 22 48.9 47 21.5 69 26.1
SSM 17 37.8 77 35.2 94 35.6
In situ 1 2.2 48 21.9 49 18.6
Others 1 2.2 25 11.4 26 9.8
Missing data 4 8.9 22 10.0 26 9.8
Node status            
N0 29 64.4 212 96.8 241 91.3
N+ 15 33.3 5 2.3 20 7.6
NX 1 2.2 2 0.9 3 1.1
Fraction (%)            
0 (0) 1 2.2 8 3.7 9 3.4
1-25 (1) 9 20.0 18 8.2 27 10.2
25-75 (2) 11 24.4 36 16.4 47 17.8
75-100 (3) 24 53.3 152 69.4 176 66.7
Missing data 0   5 2.3 5 1.9
Intensity of staining            
Negative (0) 1 2.2 8 3.7 9 3.4
Weak (1) 7 15.6 14 6.4 21 8.0
Strong (2) 37 82.2 192 87.7 229 86.7
Missing data 0   5 2.3 5 1.9
MITF Fraction/Intensity            
3/2 22 48.9 146 66.7 168 63.6
2/2 7 15.6 31 14.2 38 14.4
3/1 2 4.4 6 2.7 8 3.0
2/1 4 8.9 5 2.3 9 3.4
1/2 8 17.8 15 6.8 23 8.7
1/1 1 2.2 3 1.4 4 1.5
0/0 1 2.2 8 3.7 9 3.4
Missing data 0   5 2.3 5 1.9
1Applies to invasive tumors
NM: Nodular malignant melanoma, SSM: Superficial spreading melanoma
Table 1: Characteristics and distribution of MITF expression in patients dead from malignant melanoma (dead) and those alive or dead from other causes (not-dead) at end of follow-up (number and percentage).