ALK and neoplasm: Immunohistochemical staining revealed the tumor cells to be positive moderately and diffusely for CD34 (Fig. 1f) and focally for SMA and negative for Cam5.2, epithelial membrane antigen (EMA), desmin, calponin, TLE-1, CD99, Stat6, anaplastic lymphoma kinase (ALK, 1A4), SOX10, and S100 protein.