301780.fig.002a
(a)
301780.fig.002b
(b)
301780.fig.002c
(c)
301780.fig.002d
(d)
Figure 2: Immunohistochemical staining (IHC) evaluation of the tumor. (a) AE1/AE3: positive and diffuse cytoplasmic immunoexpression (400x); (b) p63: positive and diffuse nuclear immunoexpression (400x); (c) Ki-67: high cell proliferation index (approximately 70%) (400x); (d) thyroglobulin, TTF-1, CEA, and calcitonin: negative immunoexpression (400x).