Figure 1.

Immunohistochemistry on tissue microarray sections of breast cancers of the luminal subtype. A: Expression of estrogen receptor in 100% of tumor cells in a grade III inflammatory case. B: Strong expression of P-cadherin in 100% of tumor cells in the same case. C: Higher magnification showing the cell membrane localization. D: Expression of estrogen receptor in 100 % of tumor cells in a more differentiated (grade II) inflammatory case. E: Moderate expression of P- cadherin in 100% of tumor cells in the same case. F: Higher magnification showing the cell membrane localization. G: Luminal grade II non inflammatory case with 100% estrogen receptor-positive cells. H: Absence of expression of P-cadherin in the same non inflammatory case; note the positive internal control on myoepithelial cells of the normal duct. I: Higher magnification showing the cell membrane localization of the myoepithelial cells by contrast to the negativity of the luminal normal cells.