Why get tested?
To determine whether a breast cancer tumor is positive for Her-2/neu, which helps to guide treatment and determine prognosis

When to get tested?
If you have been diagnosed with invasive breast cancer and your doctor wants to determine whether the Her-2/neu gene is being over-expressed in the tumor

Sample required?
A sample of breast cancer tissue obtained during a biopsy; sometimes a blood sample, drawn from a vein in your arm, is also required