NCCN Guidelines for Patients® | Melanoma - page 28

28
NCCN Guidelines for Patients
®
: Melanoma
Version 1.2013
Part 3: Melanoma staging
• Tis
means abnormal cells are in the epidermis only.
• T1
tumors are ≤1 mm thick.
o
T1a
tumors have a mitotic rate of <1/mm
2
and no
ulceration.
o
T1b
tumors have a mitotic rate of ≥1/mm
2
and/or
have ulceration.
• T2
tumors are 1.01 to 2.0 mm thick.
o
T2a
tumors do not have ulceration.
o
T2b
tumors have ulceration.
• T3
tumors are 2.01 to 4.0 mm thick.
o
T3a
tumors do not have ulceration.
o
T3b
tumors have ulceration.
• T4
tumors are >4.0 mm thick.
o
T4a
tumors do not have ulceration.
o
T4b
tumors have ulceration.
Figure 9. Growth of melanoma into the skin
Illustration Copyright © 2013 Nucleus Medical Media, All rights reserved.
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