Acral lentiginous melanoma: an immunohistochemical study of 20 cases

Authors

  • You Chan Kim MD,

    Corresponding author
    1. From the Department of Dermatology and Pathology, Dankook University, College of Medicine, Cheonan, and the Department of Dermatology and Pathology, Yonsei University, Seoul, Korea
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  • Min Geol Lee MD,

    1. From the Department of Dermatology and Pathology, Dankook University, College of Medicine, Cheonan, and the Department of Dermatology and Pathology, Yonsei University, Seoul, Korea
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  • Sung Whan Choe MD,

    1. From the Department of Dermatology and Pathology, Dankook University, College of Medicine, Cheonan, and the Department of Dermatology and Pathology, Yonsei University, Seoul, Korea
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  • Mn Cheol Lee MD,

    1. From the Department of Dermatology and Pathology, Dankook University, College of Medicine, Cheonan, and the Department of Dermatology and Pathology, Yonsei University, Seoul, Korea
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  • Han Gil Chung MD,

    1. From the Department of Dermatology and Pathology, Dankook University, College of Medicine, Cheonan, and the Department of Dermatology and Pathology, Yonsei University, Seoul, Korea
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  • Sang-Ho Cho MD

    1. From the Department of Dermatology and Pathology, Dankook University, College of Medicine, Cheonan, and the Department of Dermatology and Pathology, Yonsei University, Seoul, Korea
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You Chan Kim, md, Department of Dermatology, College of Medicine, Dankook University, 16–5, Anseo-dong, Cheonan, Chungcheong Nam Do, 330–714, Korea. E-mail: kyccc@dku.edu

Abstract

Background Though acral lentiginous melanoma (ALM) is a major type of malignant melanoma, no immunohistochemical study on this type of melanoma has been reported.

Objective The purpose of this study is to analysis the immunohistochemical findings of ALM using routinely used immune markers.

Methods An immunohistochemical study was performed on paraffin sections of 20 ALMs using S-100 protein, HMB-45, MART-1, vimentin, epithelial membrane antigen (EMA) and CAM 5.2.

Results S-100 protein (95%) was found to be a more sensitive marker than either HMB-45 (80%) or MART-1 (70%) for recognizing ALM. Melanin bleaching was useful for recognizing heavily pigmented ALM using both S-100 protein and HMB-45. The intensity of HMB-45 correlated well with the melanin content. However, there was no significant correlation between the intensity of S-100 protein and the melanin content. One and two out of 20 cases stained focally with EMA and CAM5.2, respectively, but these cases stained also with HMB-45 and/or S-100 protein.

Conclusions S-100 protein and HMB-45 were relatively sensitive markers for recognizing ALM. Despite the occasional positivity for the epithelial markers in ALM, all epithelial marker-positive cases stained also with HMB-45 and/or S-100 protein. Therefore, we recommend that the panel of antibodies used for recognizing ALM should contain at least S-100 protein and HMB-45.

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