<prompt> Immunohistochemical examinations of a patient shows positive for HMB 45. She may have:SarcomaMelanomaCarcinomaNone of the above  <response>: S-100 and HMB-45 are commonly used tumor markers for melanoma. Select Immunohistochemical Stains: Immunohistochemical Stain Neoplasms that Stain Positive Cytokeratin Carcinomas Desmin Benign and malignant neoplasms of smooth and skeletal muscle Glial fibrillary acidic protein GFAP Astrocytomas HMB-45 Melanoma -Fetoprotein AFP Hepatocellular carcinoma, yolk sac tumor Chromogranin A Small cell carcinoma Ref: Wyatt C., Kemp W.L., Moos P.J., Burns D.K., Brown T.G. 2008. Chapter 20. Dermatopathology. In C. Wyatt, W.L. Kemp, P.J. Moos, D.K. Burns, T.G. Brown Eds, Pathology: The Big Picture. 