Table 1. Immunoreactive score (IRS) of immunohistochemical staining.
Percentage of positive cells | Intensity of staining | IRS |
---|---|---|
0 (no positive cells) | 0 (no reaction) | 0–2 (negative) |
1 (< 10% positive cells) | 1 (mild reaction) | 3–4 (mild) |
2 (10–50% positive cells) | 2 (moderate reaction) | 5–8 (moderate) |
3 (50–80% positive cells) | 3 (intense reaction) | 9–12 (strongly positive) |
4 (> 80% positive cells) |