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- W2034673683 abstract "Because of its known heterogeneity, the analysis of antigen expression is crucial prior to the initiation of antigen-specific immunotherapy for melanoma. The melanoma differentiation antigens gp100, MART-1 and tyrosinase are involved in a common pathway of melanin synthesis. Peptides derived from these melanoma differentiation antigens are used in the immunotherapy of melanoma and antibodies recognizing these antigens are commonly applied to detect melanocytic lesions. One hundred and ninety-one paraffin-embedded melanoma metastases from 28 patients with 2–19 lesions (mean, 6.8) developing synchronously (n=67) or asynchronously (n=124) were analysed by immunohistochemistry for the expression of the melanoma differentiation antigens, as well as cancer/testis antigens of the melanoma antigen-A (MAGE-A) family (monoclonal antibodies 77B and 57B), anti-S100 and SM5-1. The overall reactivities were 81.6% (gp100), 79.5% (MART-1), 59.6% (tyrosinase), 59.1% (77B), 60.7% (57B), 93.2% (S100) and 91.6% (SM5-1). Twenty-seven lesions (14.1%) were positive for all tumour-associated antigens, 75 lesions (39.2%) were negative for one antigen and 87 lesions (45.5%) were negative for several tumour-associated antigens. Co-ordinated loss was found for lesions negative for gp100 and MART-1 (9.4%, P<0.0005), gp100 and tyrosinase (11.0%, P=0.009), MART-1 and tyrosinase (15.2%, P<0.0005) and gp100, MART-1 and tyrosinase (8.9%, P<0.0005), which is up to six times higher than the expected calculated loss. This co-ordinated loss of melanoma differentiation antigens in melanoma did not include cancer testis antigens and S100 or SM5-1. On average, the melanoma differentiation antigens stained 50–65% of cells within a lesion, and 10–39% of synchronous clusters were heterogeneous for melanoma differentiation antigen expression. In conclusion, broader polypeptide vaccines should be used for melanoma immunotherapy." @default.
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- W2034673683 date "2006-04-01" @default.
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- W2034673683 title "Concordant loss of melanoma differentiation antigens in synchronous and asynchronous melanoma metastases: implications for immunotherapy" @default.
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- W2034673683 doi "https://doi.org/10.1097/01.cmr.0000200489.55099.20" @default.
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