Immunohistochemically the tumour cells showed an expression of Vimentin (Fig. 3C) and CD117 (Fig. 3E), a focal expression of CD34, smooth-muscle-actin (not shown) and a nuclear expression of the proliferation-associated Ki-67-antigen in approximately 5-10% of the tumour cells (Fig. 3F). Here, MKI67 is linked to neoplasm.