Collaborative Stage

Collaborative Stage for TNM 7 - Revised 01/27/2010 [ Schema ]

CS Site-Specific Factor 9
Mitotic Count

Note 1: Record mitotic count as documented in the pathology report. For ocular melanomas, this count is usually documented as mitoses per 40 high power fields (40x field). For other sites in which mitotic count is collected, this denominator may vary.
Note 2: Code the specific mitotic count only. If the count is only characterized as high or low or above or below a certain value, code 999 in this field.

Code	Description
000	0 mitoses per 40 high-power fields (40x field) 0 mitoses per 4 square millimeters Mitoses absent No mitoses present
001-008	.1-.8 mitoses per 40 high-power fields (40x field) .1-.8 mitoses per 4 square millimeters
009	.9 mitoses per 40 high-power fields (40x field) .9 mitoses per 4 square millimeters Stated as less than 1 mitoses per 40 high-power fields (40x field) Stated as less than 1 mitoses per 4 square millimeters
010-100	1-10 mitoses per 40 high-power fields (40x field) 1-10 mitoses per 4 square millimeters
110	11 or more mitoses per 40 high-power fields (40x field) 11 or more mitoses per 4 square millimeters
988	Not applicable: Information not collected for this case
999	Specific mitotic count unknown or not stated Unknown information Not documented in patient record