Immunostaining was done with appropriate positive and negative controls and revealed:
Estrogen receptor: negative in tumor cells.
Progesterone receptor: negative in tumor cells.
HER2/neu: positive in tumor cell, score 2.
Ki-67 labeling index about 10%.
Referred paraffin blocks for immunostaining of right breast, modified radical mastectomy diagnosed as invasive duct carcinoma.
Eighteen referred paraffin blocks.
Right breast, modified radical mastectomy, immunostaining: