Research Article
Immunohistochemical Analysis of CD99 and PAX8 in a Series of 15 Molecularly Confirmed Cases of Ewing Sarcoma
Table 3
The immunoreactive score (IRS).
| A (percentage of positive cells) | B (intensity of staining) | IRS score (multiplication of A and B) |
| 0 = no positive cells | 0 = no color reaction | 0-1 = negative | 1 ≤ 10% of 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 = intense reaction | 9–12 = strongly positive | 4 ≥ 80% of positive cells | | |
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