ALK and melanoma: Immunohistochemical (IHC) staining was positive for human melanoma black-45 (HMB-45), Melan-A, and Ki-67 (LI 30 %), whereas staining for S-100 protein (Fig. 3), cytokeratin (CK5/6, CK7), CD68, CD56, P63, TTF-1, P40, Napsin A, ALK D5F3, ALK D5F3 N, Syn, and CgA were negative.