From: Relationship between the expression of cyclooxygenase 2 and MDR1/P-glycoprotein in invasive breast cancers and their prognostic significance
Percentage of positive cells
Points
Intensity of reaction
No positive cells
0
No reaction
<10%
1
Weak reaction
10–50%
2
Moderate reaction
51–80%
3
Intense reaction
>80%
4