Table 4.

Evaluation of immunohistochemical reactions with the use of the ImmunoReactive Score (IRS)

% positive cells	Intensity of reaction	IRS
0 = no positive cells	0 = no color reaction	0-1 = negative
1 ≤10% positive cells	1 = mild reaction	2-3 = mild
2 = 10-50% positive cells	2 = moderate reaction	4-8 = moderate
3 = 51-80% positive cells	3 = strong reaction	9-12 = strong
4 ≥81% positive cells