Mitotic Rate Melanoma
Description
Mitotic Rate Melanoma, the number of mitoses per square millimeter based on pathological evaluation, is a prognostic factor for melanoma of the skin.
Mitotic count is a way of describing the potential aggressiveness of a tumor. Record the number of cells actively dividing as determined by the pathologist. The count will vary according to the type of tumor.
Rationale
Mitotic Rate Melanoma is a Registry Data Collection Variable in AJCC. It was previously collected as Melanoma Skin, CS SSF #7.
Additional Info
**Source documents:** pathology report
**Other names include** mitotic rate, mitotic index (a ratio—do not record this measurement), mitotic activity
For further information, refer to the **Melanoma of the Skin** cancer protocol published by the College of American Pathologists for the AJCC Staging System *Melanoma of the Skin*
Notes
**Note:** **Physician Statement**
* Physician statement of the Mitotic Rate Melanoma can be used to code this data item when no other information is available.
Coding Guidelines
**1)** Record the mitotic rate/count as documented in the pathology report.
**2)** If there is more than one pathology report for the same melanoma at initial diagnosis and different mitotic counts are documented, code the highest mitotic count from any of the pathology reports.
**3)** The term "mitotic figures" is the same as mitoses.
Default
X8
Metadata
SSDI
| Code |
Description |
| 00 |
0 mitoses per square millimeter (mm)
Mitoses absent
No mitoses present |
| 01-99 |
1 - 99 mitoses/square mm
(Exact measurement in mitoses/square mm) |
| X1 |
100 mitoses/square mm or more |
| X2 |
Stated as "less than 1 mitosis/square mm"
Stated as "nonmitogenic" |
| X3 |
Stated as "at least 1 mitosis/square mm"
Stated as "mitogenic" |
| X4 |
Mitotic rate described with denominator other than square millimeter (mm) |
| X7 |
Test ordered, results not in chart |
| X8 |
Not applicable: Information not collected for this case
(If this information is required by your standard setter, use of code X8 may result in an edit error.) |
| X9 |
Not documented in medical record
Mitotic Rate Melanoma not assessed or unknown if assessed |
