IHC revealed that the tumor cells showed diffuse and faint EMA positivity with a delicate bipolar staining pattern (Fig. 3A), focally positive staining for MUC4 (in less than 10 % tumor cells)(Fig. 3B), claudin-1(in 10 %-15 % tumor cells) (Fig. 3C) and CD34 (in less than 5 % tumor cells with a similar staining pattern with EMA)(Fig. 3D), and negative staining for GLUT1, S100 protein, estrogen receptor, progesterone receptor, DOG1, smooth muscle actin (SMA), HMB45 and STAT6. This evidence concerns the gene MUC1 and neoplasm.