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Characteristics of primary tumor (n = 3629, only with four clinical classifications)
| Number | % of Total | |
|---|---|---|
| Ulceration | ||
| Yes | 1055 | 29.1% |
| No | 2429 | 66.9% |
| Not described | 145 | 4.0% |
| Regression | ||
| Yes | 125 | 3.4% |
| No | 2026 | 55.8% |
| Not described | 1218 | 40.8% |
| Clark's classification | ||
| 1 | 649 | 17.9% |
| 2 | 338 | 9.3% |
| 3 | 409 | 11.3% |
| 4 | 794 | 21.9% |
| 5 | 414 | 11.4% |
| Not described | 1023 | 28.2% |
| Breslow's thickness | ||
| Average | 3.73 mm | |
| Median | 2.20 mm | |
