Collaborative Stage

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

CS Site-Specific Factor 5
Mitotic Count

Note: Record mitotic count as documented in the pathology report. For gastrointestinal stromal tumors, this count is usually documented as mitoses per 50 high power fields (40X field). For other sites in which mitotic count is collected, this denominator may vary.

Code	Description
000	0 mitoses per 50 high-power fields (40x field) 0 mitoses per 5 square millimeters Mitoses absent No mitoses present
001-008	.1-.8 mitoses per 50 high-power fields (40x field) .1-.8 mitoses per 5 square millimeters
009	.9 mitoses per 50 high-power fields (40x field) .9 mitoses per 5 square millimeters Stated as less than 1 mitoses per 50 high-power fields (40x field) Stated as less than 1 mitoses per 5 square millimeters
010-100	1-10 mitoses per 50 high-power fields (40x field) 1-10 mitoses per 5 square millimeters
110	11 or more mitoses per 50 high-power fields (40x field) 11 or more mitoses per 5 square millimeters
888	OBSOLETE DATA CONVERTED V0200 See code 988 Not applicable for this site
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	Specific number not stated, described less than or equal to 5 mitoses per 50 high-power fields (40x field) Specific number not stated, described less than or equal to 5 mitoses per 5 square millimeters
995	Specific number not stated, described as greater than 5 mitoses per 50 high-power fields (40x field) Specific number not stated, described as greater than 5 mitoses per 5 square millimeters
999	Unknown Not stated Not documented in patient record