Staging Melanoma
Stages 0-IV

Melanoma is now grouped into the following stages according to the revised TNM staging system:

Stage 0 melanoma involves the epidermis but has not reached the underlying dermis. This stage is also called melanoma in situ (TisN0M0). For details, see Stage 0.

Stage I melanoma is characterized by tumor thickness, presence and number of mitoses, and ulceration status. There is no evidence of regional lymph node or distant metastasis.

There are two subclasses of Stage I melanoma.

  • Stage IA: T1aN0M0 (tumor less than or equal to 1mm, no ulceration, and no mitoses)
  • Stage IB: T1bN0M0 or T2aN0M0 (tumor less than or equal to 1mm, with ulceration OR mitoses)

For details, see Stage I.

Stage II melanoma is also characterized by tumor thickness and ulceration status. There is no evidence of regional lymph node or distant metastasis.

There are three subclasses of Stage II melanoma.

  • Stage IIA: T2bN0M0 or T3aN0M0
  • Stage IIB: T3bN0M0 or T4aN0M0
  • Stage IIC: T4bN0M0

For details, see Stage II.

Stage III melanoma is characterized by the level of lymph node metastasis. There is no evidence of distant metastasis.

There are three subclasses of Stage III melanoma.

  • Stage IIIA: T1-T4a N1aM0 or T1-T4aN2aM0
  • Stage IIIB: T1-T4bN1aM0, T1-T4bN2aM0, T1-T4aN1bM0, T1-T4aN2bM0, or T1-T4a/bN2cM0
  • Stage IIIC: T1-4bN1bN0, T1-4bN2bM0, or T1-4a/bN3M0

For details, see Stage III.

Stage IV melanoma is characterized by the location of distant metastases and the level of serum lactate dehydrogenase (LDH).

Stage IV melanomas include any T or N classification. For details, see Stage IV.

The Staging Tool will guide you through the process of identifying the correct stage of melanoma. --->