Collaborative Stage

Collaborative Stage for TNM 7 - Revised 11/09/2010 [ Schema ]

CS Site-Specific Factor 3
Mitotic Count

Note 1: The mitotic count reflects the potential aggressiveness or prognosis of endocrine pancreatic tumors. This site-specific factor presumes the denominator of 10 high power fields (HPF) or its equivalent, so just the numerator (the mitotic count) is coded here. For other schemas in which mitotic count is collected, the denominator may vary. An HPF usually has a magnification objective of 40 (a 40x field).
Note 2: Record mitotic count, to the nearest tenth of a mitosis, as documented in the pathology report. For example, a mitotic count of 6/10 HPF.
Note 3: Code the specific mitotic count only per 10 HPF; assume the denominator is 10 HPF if not specified. Use code 996 only if the mitotic count is expressed with a specific denominator other than 10 HPF.

Code	Description
000	0 mitoses per 10 high-power fields (HPF) (40x field) Mitoses absent, no mitoses present, no mitotic activity
001-008	0.1 - 0.8 mitosis per 10 HPF (40x field) 0.1 - 0.8 mitosis per
009	0.9 mitosis per 10 HPF (40x field) Stated as less than 1 mitosis per 10 HPF (40x field)
010-100	1-10 mitoses per 10 HPF (40x field)
110	11 or more mitoses per 10 HPF (40x field)
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 4 mitoses per 10 HPF (40x field) Stated as low mitotic count or rate with no specific number
992	Specific number not stated, described as more than 4 mitoses per 10 HPF (40x field) Stated as high mitotic count or rate with no specific number
995	OBSOLETE DATA CONVERTED V0203 See code 992 Specific number not stated, described as greater than 4 mitoses per 10 high-power fields (40x field) Specific number not stated, described as greater than 4 mitoses per square millimeters
996	Mitotic count described with denominator other than 10 HPF (40x field)
998	No histologic specimen from primary site
999	Unknown or no information Not documented in patient record