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朱正龙
It may be a invasive ductal carcinoma. You have to order IHC for myoepithelial markers (p63, smooth muscle heavy chain or SMA) to differentiate IDC from sclerosing adenosis in clinical practice if you are not 100% sure. Also you can order the IHC stains for E-cadherin and p120 to differentiate ductal carcinoma from lobular carcinoma.
Ductal carcinoma (invasive+in situ): E-cadherin and p120, both positive with membrane stain.
Lobular carcinoma (invasive +in situ): E-cadherin negative, p120 with diffuse cytoplasmic stain.
p120 is better than E-cadherin if one stain is ordered. In most cases I always order both.