All cases (n* = 322) | Class 1 (n = 248) | Class 2 (n = 74) | p value*** | |
---|---|---|---|---|
Age, median (range) | 58 (18–87) | 57 (18–87) | 65 (23–85) | 0.003 |
Gender | ||||
Female | 146 (45%)** | 123 (50%) | 23 (31%) | 0.005 |
Male | 176 (55%) | 125 (50%) | 51 (69%) | |
Breslow thickness, median (range) | 1.2 (0.2–12.0) | 1.0 (0.2–7.0) | 2.5 (0.4–12.0) | <0.001 |
Ulceration | ||||
Absent | 238 (74%) | 204 (82%) | 34 (46%) | <0.001 |
Present | 58 (18%) | 23 (9%) | 35 (47%) | |
Unknown | 26 (8%) | 21 (9%) | 5 (7%) | |
Mitotic rate | ||||
≤1/mm2 | 222 (69%) | 176 (71%) | 46 (62%) | 0.151 |
>1/mm2 | 100 (31%) | 72 (29%) | 28 (38%) | |
Node status | ||||
Negative | 286 (89%) | 228 (92%) | 58 (78%) | 0.007 |
Positive | 36 (11%) | 20 (8%) | 16 (22%) | |
Primary tumor location | ||||
Extremity | 178 (55%) | 133 (54%) | 45 (61%) | 0.547 |
Head and neck | 58 (18%) | 46 (19%) | 12 (16%) | |
Trunk | 86 (27%) | 69 (28%) | 17 (23%) | |
AJCC stage | ||||
None | 3 (1%) | 3 (1%) | 0 (0%) | <0.001 |
I | 1 (0%) | 1 (0%) | 0 (0%) | |
IA | 63 (20%) | 62 (25%) | 1 (1%) | |
IB | 145 (45%) | 129 (52%) | 16 (22%) | |
IIA | 39 (12%) | 23 (9%) | 16 (22%) | |
IIB | 26 (8%) | 9 (4%) | 17 (23%) | |
IIC | 8 (2%) | 0 (0%) | 8 (11%) | |
III | 30 (9%) | 16 (6%) | 14 (19%) | |
IIIA | 3 (1%) | 3 (1%) | 0 (0%) | |
IIIB | 3 (1%) | 1 (0%) | 2 (3%) | |
IV | 1 (0%) | 1 (0%) | 0 (0%) | |
Location of first recurrence | ||||
Nodal/regional | 13 | 3 | 10 | 0.69 |
Distant | 12 | 2 | 10 |