Score | Staining pattern |
Score 0 | Negative, none of the cells revealed positivity for the marker. |
Score 1+ | Weak or mild staining, (5% - 10%) positive of tumor cells. |
Score 2+ | Moderate staining, less than 25% of tumor cells are stained positive. |
Score 3+ | Strong staining, (25% - 50%) of tumor cells are stained positive. |
Score 4+ | Highly strong staining, over 50% of tumor cells are stained positive. |