Description
Why It’s Done:
This test is critical for:
• Diagnosing the type and subtype of breast cancer.
• Determining hormone receptor status, which affects the choice of hormonal therapies.
• Evaluating HER2 status, which helps in deciding on anti-HER2 targeted therapies (like trastuzumab).
• Assessing EGFR overexpression, which may influence prognosis and emerging treatment options.
By understanding these markers, doctors can better predict how aggressive the cancer is, whether it will respond to certain treatments, and the likely outcomes (prognosis).
Preparation:
• No special preparation is required for the patient.
• The test is performed on a tissue sample obtained through biopsy or surgery.
• If you’re undergoing a biopsy or surgery, your healthcare provider will give you specific pre-procedure instructions (e.g., fasting, medication adjustments).
• Make sure to inform your doctor about any current medications, medical conditions, or prior cancer treatments.


