HMB 45 is a tumor marker for

Malignant melanoma expresses HMB45 ,S-100 and vimentin  HMB 45 is present in melanosome and is more specific  S-100 is more sensitive but is non specific (also present in LAngerhan's cell histiocytosis, neural tumors and sarcomas like Liposarcoma and Chondrosarcoma)