Table I.

Intensity and proportion scores for normal uterine smooth muscle tissue, uterine fibroid tissue and uterine leiomyosarcoma tissue.

Score	0	1	2	3
Intensity	Not stained at all	Slightly stained with strong to medium enlargement	Stained with low to medium enlargement	Stained well with weak enlargement
Proportion	<1%	1-10%	10-50%	>50%

The intensity score (0-3) and proportion score (0-3) were used as evaluation methods. Intensity refers to degree of staining; depending on the degree of staining, stained cells are classified into one of four classes: Negative, weakly stained, moderately stained and strongly stained. Proportion refers to the percentage of stained cells. Depending on the percentage of stained cells, one of four classes (<1%, 1-10%, 10-50%, >50%) is assigned. A proportion value of 10% was scored as 2.