Collaborative Stage

Note 1: This is a microscopic evaluation of the degree of tumor cell differentiation from surgically removed specimens to define histology grade (G). The higher the grade is the worse the tumor malignancy.
Note 2: Notable nuclear atypia, inappropriate for the architectural grade, raises the grade to 3.
Note 3: Serous, clear cell, and mixed mesodermal tumors are high risk and considered Grade 3.
Note 4: Adenocarcinomas with benign squamous elements (squamous metaplasia) are graded according to the nuclear grade of the glandular component.

Code	Description
001	Recorded as Grade I or 1 5% or less of a non-squamous or non-morular solid growth pattern
002	Recorded as Grade II or 2 6% to 50% of a non-squamous or non-morular solid growth pattern
003	Recorded as Grade III or 3 More than 50% of a non-squamous or non-morular solid growth pattern
988	Not applicable: Information not collected for this case
999	No 2, 3, or 4 grade system available Unknown

CS Site-Specific Factor 7
Percentage of Non-Endometrioid Cell Type in Mixed Histology Tumors