Fig. 6

Immunohistochemical findings of solid papillary carcinoma with reverse polarity. a Diffuse and strong cytoplasmic immunostaining in tumor cells for CK5/6. b Negativity for myoepithelial markers as p63. c Negativity for myoepithelial markers as calponin. d Diffuse and strong immunostaining for calretinin. e Low and weak nuclear immunostaining for estrogen receptor in tumor cells. f Low Ki67 proliferation index in tumor cells