Melanoma staging

Staging
Further context on cancer staging is available at TNM.

Also of importance are the "Clark level" and "Breslow depth" which refer to the microscopic depth of tumor invasion.

Melanoma stages:

Stage 0: Melanoma in Situ (Clark Level I), 100% Survival

Stage I/II: Invasive Melanoma, 85-95% Survival
 * T1a: Less than 1.00 mm primary, w/o Ulceration, Clark Level II-III
 * T1b: Less than 1.00 mm primary, w/Ulceration or Clark Level IV-V
 * T2a: 1.00-2.00 mm primary, w/o Ulceration

Stage II: High Risk Melanoma, 40-85% Survival
 * T2b: 1.00-2.00 mm primary, w/ Ulceration
 * T3a: 2.00-4.00 mm primary, w/o Ulceration
 * T3b: 2.00-4.00 mm primary, w/ Ulceration
 * T4a: 4.00 mm or greater primary w/o Ulceration
 * T4b: 4.00 mm or greater primary w/ Ulceration

Stage III: Regional Metastasis, 25-60% Survival
 * N1: Single Positive Lymph Node
 * N2: 2-3 Positive Lymph Nodes OR Regional Skin/In-Transit Metastasis
 * N3: 4 Positive Lymph Nodes OR Lymph Node and Regional Skin/In Transit Metastases

Stage IV: Distant Metastasis, 9-15% Survival
 * M1a: Distant Skin Metastasis, Normal LDH
 * M1b: Lung Metastasis, Normal LDH
 * M1c: Other Distant Metastasis OR Any Distant Metastasis with Elevated LDH

Based Upon AJCC 5-Year Survival With Proper Treatment