Immunohistochemistry of IPC-366 pellet, paraffin sections.

A) Pancytokeratin (AE1/AE3) (10X); intense immunolabeling and numerous positive cells. B) CK14; intense immunolabeling and numerous positive cells (10X). C) Vimentin; moderate immunolabeling and numerous positive cells (10X). D) p63; negative (20X). E) α-smooth muscle actin, negative cells (10X). F) Estrogen receptor; negative cells (20X). G) Progesterone receptor; negative cells (20X). H) HER-2; negative cells (20X). I) E-Cadherin; intense membranous immunolabeling in numerous cells (20X). J) COX-2; most of the cells are moderately positive; some cells are intensely positive (10X). K) COX-2; some cells strongly positive showing features of malignancy (binucleated cell, arrow) (40X). L) Ki-67 proliferation marker; many nuclei are positive (10X).