Collaborative Stage

Note 1: Code measured thickness (depth) of tumor, not size. Depth for Merkel cell carcinoma of skin is similar to Breslow tumor depth in melanoma of the skin. Record the actual measurement in tenths of millimeters (mm) from the pathology report.
Note 2: If tumor was reported as transected by pathology, record the measurement from the specimen with the thickest documented depth and note in CS Site-Specific Factor 19 that tumor was transected.
Note 3: If tumor is in situ (CS Extension code 000), code measured thickness as 999.

Code	Description
000	No mass/tumor found
001-979	00.1 - 97.9 millimeters (mm ) (Exact measurement to nearest TENTH of mm) Examples: 001 0.1 mm 002 0.2 mm 010 1 mm 074 7.4 mm 100 10 mm, 1 centimeter (cm) 105 10.5 mm 979 97.9 mm
980	98.0 mm or larger
988	Not applicable: Information not collected for this case (May include cases converted from code 888 used in CSv1 for "Not applicable" or when the item was not collected. If this item is required to derive T, N, M, or any stage, use of code 988 may result in an error.)
990	Microinvasion Microscopic focus or foci only and no size given
998	No histologic examination of primary site
999	Unknown or no information Not documented in patient record

CS Site-Specific Factor 1
Measured Thickness (Depth)