Score

Staining pattern

Score 0

Completely negative.

Score 1+

Faint perceptile staining of the membrane in >10% of the malignant cells.

Score 2+

Moderate staining of the partial membrane in >10% of the malignant cells.

Score 3+

Strong circumferential staining of the entire membrane creating a fishnet pattern in >30% of the malignant cells.