In Situ Carcinoma 15–30
Ductal carcinoma in situ 80
Lobular carcinoma in situ 20
Invasive Carcinoma 70–85
No special type carcinoma ("ductal")(NOS) 79
Lobular carcinoma 10
Tubular/cribriform carcinoma 6
Mucinous (colloid) carcinoma 2
Medullary carcinoma 2
Papillary carcinoma 1
Metaplastic carcinoma
A. Estrogen receptor is detected in the nucleus by immunohistochemical studies. Progesterone receptor has the same appearance.
B. HER2/neu overexpression is detected on the cell membrane by immunohistochemistry.
C. Amplification of the HER2/neu gene can be detected by FISH analysis
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