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Scoring system for evaluation of O-6-methylguanine-DNA methyltransferase immunostaining
| Score | Category | ||
|---|---|---|---|
| Distribution | Intensity | Percentage of positive cells | |
| 0 | No staining | - | - |
| 1 | Heterogeneous | + | <20 |
| 2 | Heterogeneous | ++/+++ | >20 |
| 3 | Homogenous | + | <20 |
| 4 | Homogenous | ++/+++ | >20 |
| 5 | Homogenous | ++/+++ | >50 |
+: Mild, ++: Moderate, +++: Strong staining
