Promoter hypermethylation of the death-associated protein kinase gene in breast cancer is associated with the invasive lobular subtype

被引:0
|
作者
Lehmann, U [1 ]
Celikkaya, G [1 ]
Hasemeier, B [1 ]
Länger, F [1 ]
Kreipe, H [1 ]
机构
[1] Hannover Med Sch, Dept Pathol, Inst Pathol, D-30625 Hannover, Germany
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中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Expression of death-associated protein (DAP) kinase, a proapoptotic serine/threonine protein kinase, is frequently lost in human tumors. In a study of 134 primary breast cancer specimens hypermethylation of the DAP kinase gene was found in 13% of cases. A highly significant difference (P < 0.001) of DAP kinase inactivation was observed between invasive lobular cancer (n = 19) and invasive ductal cancer (n = 85; 53% versus 9%, respectively). Hypermethylation correlated with loss of RNA expression, estrogen receptor positivity (P < 0.01), and the absence of p53 overexpression (P < 0.01). In contrast to invasive lobular cancer, the in situ-growing precursor lesion lacked epigenetic modification of the DAP kinase promotor by aberrant methylation indicating a potential role in tumor progression. Unlike the DAP kinase gene, hypermethylation of the cyclin D1 and RASSF1A genes did not correlate with a particular histological subtype or to invasiveness. We conclude that different histological subtypes of breast cancer may not only differ concerning specific chromosomal abnormalities and DNA mutations but also with regard to epigenetic inactivation patterns.
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页码:6634 / 6638
页数:5
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