Fig. 3: Immnuhistochemical profile. A. Cytokeratin 7 stain showing a strong reactivity in the normal ductular cells. No positivity is seen in neoplastic cells (DAB, 100X). B,C. CD34 and CD99 expression in the spindle-shaped tumour cells (DAB, 400X). D. Mast cells are inmunoreactive to CD117. Note the negativity in the tumour cells (DAB, 400X).