NAACCR Item #3893: Mitotic Rate Melanoma

Item # Length Source of Standard Year Implemented Version Implemented Year Retired Version Retired
3,893 2 NAACCR 2018 18

NAACCR XML: Tumor.mitoticRateMelanoma


Mitotic Rate Melanoma, the number of mitoses per square millimeter based on pathological evaluation, is a prognostic factor for melanoma of the skin.


Mitotic Rate Melanoma is a Registry Data Collection Variable in AJCC. It was previously collected as Melanoma Skin, CS SSF# 7.


000 mitoses per square millimeter (mm) Mitoses absent No mitoses present
01-991 - 99 mitoses/square mm (Exact measurement in mitoses/square mm)
X1100 mitoses/square mm or more
X2Stated as "less than 1 mitosis/square mm" Stated as "nonmitogenic"
X3Stated as "at least 1 mitosis/square mm" Stated as "mitogenic"
X4Mitotic rate described with denominator other than square millimeter (mm)
X7Test ordered, results not in chart
X8Not 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.)
X9Not documented in medical record Mitotic Rate Melanoma not assessed or unknown if assessed

Each Site-Specific Data Item (SSDI) applies only to selected primary sites, histologies, and years of diagnosis. Depending on applicability and standard-setter requirements, SSDIs may be left blank.