In all cases tested, the tumor cells were positive for PAX8 (2/2, diffusely in both) (Figure 5A), GATA3 (4/4, diffusely in two and focally in two) (Figures 5B, C), and TTF1 (3/3, focally in two and diffusely in one) (Figures 5D, E), and the one (case 3) which was diffusely positive for TTF1 also diffusely expressed GATA3. Here, PAX8 is linked to neoplasm.