He went on to have a core needle biopsy and insertion of a tissue marker clip and underwent a sentinel lymph node scan and excision.

Pathology report:

1. Left breast, 11 o'clock, trucut biopsy: Infiltrating ductal carcinoma.
2. Left axilla, trucut biopsy: Lymph node fragments with no evidence of malignancy.

Immunohistochemical studies:

1. Weak, incomplete membranous immunoreactivity for Her-2/Neu protein expression observed in 10% of infiltrating tumor cells (score 1, range 1- 3).
   Interpretation: negative.
   The study was performed with monoclonal Ab-4B5.
2. Estrogen receptor immunoreactivity positive.
   Quantitation: 90% of tumor cells positive.
   Intensity of staining: strong.
   Internal control: not present.
   The study was performed with monoclonal Ab-SPI. 
3. Progesterone receptor immunoreactivity positive. 
   Quantitation: 50% of tumor cells positive. 
   Intensity of staining: weak to strong. 
   Internal control: not present. 
   The study was performed with monoclonal Ab-16. 
4. Ki67 expressed in 30% of tumor cells. (score 3, range 1-4). 
   The study was performed with monoclonal Ab-Mib 1. 
   Positive controls show the expected staining.
   Negative controls show no immunostaining.