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- W2171036227 abstract "The p16(INK4a) gene methylation has been reported to be a major tumorigenic mechanism.We evaluated the methylation status of the p16(INK4a) genes in 231 invasive breast cancer and 90 intraductal carcinoma specimens using a methylation-specific polymerase chain reaction and p16 protein expression using immunohistochemistry. The quantity of cell-free methylated p16(INK4a) DNA in the plasma samples of 200 patients with invasive breast cancer was also examined using a fluorescence-based real-time polymerase chain reaction assay.The frequencies of p16(INK4a) methylation in invasive and intraductal tumors were 52.8% (122/231) and 57.8% (52/90), respectively. The p16 protein was overexpressed in 145 of the 231 invasive carcinomas (62.8%) and 63 of the 90 intraductal carcinomas (70%). High p16 expression in invasive carcinomas correlated significantly with a high histologic grade, a negative estrogen receptor and progesterone receptor status, p53 immunoreactivity and high Ki-67 expression with immunohistochemistry. In addition, the methylation index of p16(INK4a) was significantly higher in the cancer patients than the normal controls (p<0.001).High p16 immunoreactivity correlated with a loss of differentiation in breast carcinomas and high frequency of p16(INK4a) promoter methylation in both invasive and intraductal carcinomas, suggesting it may be involved in the pathogenesis of breast cancer." @default.
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- W2171036227 date "2012-01-01" @default.
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- W2171036227 title "Methylation and Immunoexpression of<i>p16<sup>INK4a</sup></i>Tumor Suppressor Gene in Primary Breast Cancer Tissue and Their Quantitative<i>p16<sup>INK4a</sup></i>Hypermethylation in Plasma by Real-Time PCR" @default.
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- W2171036227 doi "https://doi.org/10.4132/koreanjpathol.2012.46.6.554" @default.
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