Fig. 6

Immunohistochemistry shows the expression of retinoic acid receptors (RAR-α, −β, −γ) in SeCC cases. a–d: The expression of RAR-α was weakly positive in both groups. (a) case 2; (b) case 6; (c) case16; (d) control. e–h: Aberrant expression of RAR-β was observed in the SeCC cases on the tumor cells. (e, f) case 6; (g) case 7; (h) control; i-l: The expression of RAR-γ was weak-to-no staining in both groups. (i) case 3; (j) case 10; (k) case 15; (l) control . Scale bars represent 50 μm