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HMB-45 detection in adenocarcinomas.

C Hancock1, B C Allen, G A Herrera

  • 1Department of Pathology, University of Mississippi Medical Center, Jackson 39216-4505.

Archives of Pathology & Laboratory Medicine
|September 1, 1991
PubMed
Summary
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The HMB-45 antibody is not absolutely specific for melanoma, as it can react with some adenocarcinomas. While HMB-45 remains the most specific marker for melanoma diagnosis, its limitations require careful consideration in differential diagnostics.

Area of Science:

  • Oncology
  • Immunohistochemistry
  • Pathology

Background:

  • HMB-45 is often considered a specific marker for melanoma, detecting a glycoprotein in premelanosomes.
  • Its diagnostic utility in differentiating amelanotic melanoma from adenocarcinoma requires further evaluation.

Purpose of the Study:

  • To assess the absolute specificity of HMB-45 as a melanoma marker.
  • To determine the role of HMB-45 testing in the differential diagnosis of amelanotic melanoma versus adenocarcinoma.

Main Methods:

  • Immunohistochemical staining of 52 adenocarcinomas and 5 melanomas using HMB-45, S100 protein, and keratin antibodies (AE1/AE3 and polyclonal).
  • Analysis of HMB-45 reactivity in both primary and metastatic adenocarcinomas.
  • Evaluation of keratin and S100 protein expression in adenocarcinomas and melanomas.

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Main Results:

  • Approximately 9.6% of adenocarcinomas (5 cases) expressed HMB-45.
  • S100 protein was expressed in 52% of adenocarcinomas.
  • Aberrant keratin expression was observed in some melanomas, and S100 protein in non-melanoma neoplasms.

Conclusions:

  • HMB-45 is not absolutely specific for melanoma and can react with certain adenocarcinomas.
  • Consideration of HMB-45 cross-reactivity, aberrant keratin expression in melanomas, and S100 protein expression in other tumors is crucial for antibody panel evaluation.
  • HMB-45 remains the most specific available marker for supporting a melanoma diagnosis.