Journal of Korean Medical Science

  • 제17권6호
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  • Pages.801-801
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  • 2002
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  • 1011-8934(pISSN)
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  • 1598-6357(eISSN)
대한의학회 (Korean Acad Medical Sciences)
권호 표지

Correlation of Mutation and Immunohistochemistry of p53 in Hepatocellular Carcinomas in Korean People

Lee, Shi-Nae;Park, Cheol-Keun;Sung, Chang-Ohk;Choi, Jong-Sun;Oh, Young-Lyun;Cho, Jae-Won;Yoo, Byung-Chul

  • 발행 : 20021200

⟨ 이전 논문 다음 논문 ⟩

초록

The degree of correlation between sequencing and immunohistochemisty (IHC) for detecting mutations of p53 has not been well established in human hepatocellular carcinoma (HCC). We analyzed 36 HCCs from Korean people for p53 mutation at exons 4-10 by PCR-SSCP and sequencing, and compared the results with the IHC positivity. p53 mutations were identified in 7 out of 36 HCCs (19.4%). These mutations were found widely throughout exons 4-8. No mutation was detected in codon 249. Among the 7 mutations, 6 missense mutations were detected in 15 HCCs with ${\geq}5%$ immunoreactive tumor cells and one nonsense mutation was in 21 HCCs with <5% immunoreactive tumor cells. The sensitivity for p53 mutation was 85.7% (6/7), the specificity 69.0% (20/29), the predictive value of positive IHC 40.0% (6/15), and the predictive value of negative IHC 95.2% (20/21). Two missense mutations were detected in 25 cases with <10% immunoreactive tumor cells. Predictive values of both positive IHC and negative IHC were higher in ${\geq}5%$ overexpression group than in ${\geq}10%$ overexpression group or >0% overexpression group. This study suggests that 5% immunoreactivity is a reliable immunohistochemical threshold value to detect p53 mutations in HCCs and the spectrum of p53 mutations in HCCs in Korean people is different from that of high aflatoxin $B_1$ exposure areas.

키워드

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