Primary tumor (T) |
TX | Primary tumor cannot be assessed (eg, curettaged or severely regressed primary) |
T0 | No evidence of primary tumor |
Tis | Melanoma in situ |
T1 | ≤1.0 mm |
a: without ulceration and mitoses <1/mm2 |
b: with ulceration or mitoses ≥1/mm2 |
T2 | 1.01-2.0 mm |
a: without ulceration |
b: with ulceration |
T3 | 2.01-4.0 mm |
a: without ulceration |
b: with ulceration |
T4 | >4.0 mm |
a: without ulceration |
b: with ulceration |
Regional lymph nodes (N) |
NX | Patients in whom the regional nodes cannot be assessed (eg, previously removed for another reason) |
N0 | No regional metastases detected |
N1 | One lymph node |
a: micrometastases* |
b: macrometastases¶ |
N2 | Two or three lymph nodes |
a: micrometastases* |
b: macrometastases¶ |
c: in-transit met(s)/satellite(s) without metastatic lymph nodes |
N3 | Four or more metastatic lymph nodes, or matted lymph nodes, or in-transit met(s)/satellite(s) with metastatic lymph node(s) |
Distant metastasis (M) |
M0 | No detectable evidence of distant metastases |
M1a | Metastases to skin, subcutaneous, or distant lymph node, normal serum LDH |
M1b | Lung metastases, normal LDH |
M1c | Metastasis to other visceral metastases with a normal LDH, or any distant metastases and an elevated LDH |