Final Version of TNM Staging System of American Joint Committee on Cancer for Malignant Cutaneous Melanoma
| Tumor thickness (mm) | No. of node metastases | Site of metastasis | Serum LDH |
|---|---|---|---|
| T1A/B, ≤1 | N1, 1 | 1a, soft tissues | Normal |
| T2A/B, 1.01–2.0 | N2, 2 or 3 | 1b, lung | Normal |
| T3A/B, 2.01–4.0 | In-transit metastasis | 1c, any other | Normal |
| T4A/B, >4 | N3, ≥4 | Any other | Elevated |
LDH = lactate dehydrogenase; A = without ulceration; B = with ulceration.