Table 2. Human epidermal growth factor receptor 2 scoring methods proposed by the American Society of Clinical Oncology/College of American Pathologists.

Score	Description
3+	Circumferential membrane staining that is complete, intense, and in >10% of tumor cells
2+	Circumferential membrane staining that is incomplete and/or weak/moderate and in >10% of tumor cells or Complete and circumferential membrane staining that is intense and in <10% of tumor cells
1+	Incomplete membrane staining that is faint/barely perceptible and in >10% of tumor cells
0	No staining observed or Membrane staining that is incomplete and is faint/barely perceptible and in <10% of tumor cells