Table 1.

Immunoreactive score (IRS) system. IRS = (A x B)

A (% positive cells)	B (intensity)
0 = no positive cells	0 = no color reaction
1 < 10% of positive cells	1 = mild reaction
2 = 10–50% of positive cells	2 = moderate reaction
3 = 51–80% of positive cells	3 = intense reaction
4 > 80% of positive cells