HER2 what do the test results mean.

Hi 

I am having a mastectomy on Monday, found during a recent mammagram. I have opted for a mastectomy as I had a pacemaker/defibrillator fitted in September. Am hoping I will not then need radiotherapy.

I am still waiting for results of HER2 and have been told may not be back until after my operation, As first results were borderline.

what does the HER2 test mean, I have Grade 2 invasive ductal carcinoma 

I have had such a rotten year with heart failure, I seem very calm about my cancer diagnosis no tears nothing.  I am sure they will all come before or after my operation. 

Norma56 x