We are proud to announce that PhenoPath is now a Quest Diagnostics Company.
Alternate Test Names:
gp100; Melanoma Specific Antigen; HMB45
Identifies: The gp100 protein, found in premelanosomes. As such, HMB-45 is a highly sensitive and specific marker of melanoma, particularly in the metastatic setting. The epitope targeted by HMB-45 behaves as an ‘oncofetal’ antigen that is not expressed in normal, resting melanocytes but is present in reactive and neoplastic melanocytic processes. Furthermore, as a marker of a premelanosomal protein, it is also an excellent marker of clear cell sarcoma as well as PEComas.
Subcellular Localization: Cytoplasmic, granular
Organ: Skin & Mucosa
CPT Code(s): 88342 or 88341 (reference only; CPTs may vary)
Turnaround Time: Within 1-2 business days of receipt
Schedule: Monday - Friday
• Formalin-fixed, paraffin-embedded (FFPE) tissue block or cell block - OR -
• 1 unstained slide for each test requested plus 3-4 additional unstained slides cut at 4µm