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Article

A rare case of amelanotic malignant melanoma in the oral region: Clinical investigation and immunohistochemical study

  • Authors:
    • Yuichi Ohnishi
    • Masahiro Watanabe
    • Tomoko Fujii
    • Noriko Sunada
    • Hitoshi Yoshimoto
    • Hirohito Kubo
    • Masahiro Wato
    • Kenji Kakudo
  • View Affiliations / Copyright

    Affiliations: Second Department of Oral and Maxillofacial Surgery, Osaka Dental University, Chuo‑ku, Osaka 540‑0008, Japan, Department of Oral Pathology, Osaka Dental University, Hirakata‑shi, Osaka 573‑1121, Japan
  • Pages: 3761-3764
    |
    Published online on: October 20, 2015
       https://doi.org/10.3892/ol.2015.3819
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Abstract

Amelanotic malignant melanoma (AMM) is rare in the oral region. The present study examined the clinical features of this tumor in an attempt to establish diagnostic criteria. The expression of three melanocytic differentiation markers, HMB‑45, S‑100 and Melan‑A, was also measured in primary oral AMMs in order to determine whether the markers could be used to diagnose primary oral AMMs and to find out which marker was the most sensitive. It may be particularly difficult to correctly diagnose AMM that lacks a radial growth phase without immunohistochemical assistance. In the present study, mixtures of polygonal and spindle cells at different ratios were observed in the tumors with and without a radial growth phase. Immunohistochemistry was used to examine the HMB‑45, S‑100 and Melan‑A expression in the formalin‑fixed paraffin‑embedded specimens of primary oral AMMs. Comparison of staining intensities (SIs) and labeling indices (LIs) of the markers was also performed. The immunostaining results revealed that the SI of Melan‑A was significantly higher than that of S‑100 (P=0.0011). HMB‑45, S‑100 and Melan‑A also exhibited high positive rates and LIs in AMMs and, therefore, may be good markers for the immunohistochemical diagnosis of primary oral AMMs. Furthermore, Melan‑A may be a more sensitive marker than S‑100 and HMB-45, as it has a higher SI.
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Copy and paste a formatted citation
Spandidos Publications style
Ohnishi Y, Watanabe M, Fujii T, Sunada N, Yoshimoto H, Kubo H, Wato M and Kakudo K: A rare case of amelanotic malignant melanoma in the oral region: Clinical investigation and immunohistochemical study. Oncol Lett 10: 3761-3764, 2015.
APA
Ohnishi, Y., Watanabe, M., Fujii, T., Sunada, N., Yoshimoto, H., Kubo, H. ... Kakudo, K. (2015). A rare case of amelanotic malignant melanoma in the oral region: Clinical investigation and immunohistochemical study. Oncology Letters, 10, 3761-3764. https://doi.org/10.3892/ol.2015.3819
MLA
Ohnishi, Y., Watanabe, M., Fujii, T., Sunada, N., Yoshimoto, H., Kubo, H., Wato, M., Kakudo, K."A rare case of amelanotic malignant melanoma in the oral region: Clinical investigation and immunohistochemical study". Oncology Letters 10.6 (2015): 3761-3764.
Chicago
Ohnishi, Y., Watanabe, M., Fujii, T., Sunada, N., Yoshimoto, H., Kubo, H., Wato, M., Kakudo, K."A rare case of amelanotic malignant melanoma in the oral region: Clinical investigation and immunohistochemical study". Oncology Letters 10, no. 6 (2015): 3761-3764. https://doi.org/10.3892/ol.2015.3819
Copy and paste a formatted citation
x
Spandidos Publications style
Ohnishi Y, Watanabe M, Fujii T, Sunada N, Yoshimoto H, Kubo H, Wato M and Kakudo K: A rare case of amelanotic malignant melanoma in the oral region: Clinical investigation and immunohistochemical study. Oncol Lett 10: 3761-3764, 2015.
APA
Ohnishi, Y., Watanabe, M., Fujii, T., Sunada, N., Yoshimoto, H., Kubo, H. ... Kakudo, K. (2015). A rare case of amelanotic malignant melanoma in the oral region: Clinical investigation and immunohistochemical study. Oncology Letters, 10, 3761-3764. https://doi.org/10.3892/ol.2015.3819
MLA
Ohnishi, Y., Watanabe, M., Fujii, T., Sunada, N., Yoshimoto, H., Kubo, H., Wato, M., Kakudo, K."A rare case of amelanotic malignant melanoma in the oral region: Clinical investigation and immunohistochemical study". Oncology Letters 10.6 (2015): 3761-3764.
Chicago
Ohnishi, Y., Watanabe, M., Fujii, T., Sunada, N., Yoshimoto, H., Kubo, H., Wato, M., Kakudo, K."A rare case of amelanotic malignant melanoma in the oral region: Clinical investigation and immunohistochemical study". Oncology Letters 10, no. 6 (2015): 3761-3764. https://doi.org/10.3892/ol.2015.3819
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