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- Stage Criteria
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- IA Localized melanoma 0.75mm or level 2* (T1, N0, M0)
- IB Localized melanoma 0.76mm to 1.5mm or level 3* (T2, N0, M0)
- IIA Localized melanoma 1.6mm to 4mm or level 4* (T3, N0, M0)
- IIB Localized melanoma 4mm or level 5* (T4, N0, M0)
- III Limited nodal metastases involving only one regional lymph node basin
- (area), or fewer than 5 intransit metastases but without nodal metastases
- (any T, N1, M0)
- IV Advanced regional metastases (any T, N2, M0) or any patient with distant
- metastases (any T, any N, M1 or M2)
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- * When the thickness and level of invasion criteria do not coincide with a T classification,
- thickness should take precedence.