Allergy/Imm Medical News about DNA methylation, hepatocellular carcinoma

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Genome-wide DNA methylation profiles in liver tissue at the precancerous stage and in hepatocellular carcinoma
International Journal of Cancer, 08/20/09

Arai E et al. - In a study to clarify genome-wide DNA methylation profiles during hepatocarcinogenesis, it was determined that genome-wide alterations of DNA methylation may participate in hepatocarcinogenesis from the precancerous stage, and DNA methylation profiling may provide optimal indicators for carcinogenetic risk estimation and prognostication.

Methods

Bacterial artificial chromosome (BAC) array-based methylated CpG island amplification was performed on 126 tissue samples.

Results

Average numbers of BAC clones showing DNA hypo- or hypermethylation increased from noncancerous liver tissue obtained from pts with hepatocellular carcinomas (HCCs) (N) to HCCs.
N appeared to be at the precancerous stage, showing DNA methylation alterations that were correlated with the future development of HCC.
Using Wilcoxon test, 25 BAC clones, whose DNA methylation status was inherited by HCCs from N and were able to discriminate 15 N samples from 10 samples of normal liver tissue obtained from pts without HCCs (C) with 100% sensitivity and specificity, were identified.
Criteria using the 25 BAC clones were able to discriminate 24 additional N samples from 26 C samples in the validation set with 95.8% sensitivity and 96.2% specificity.
Using Wilcoxon test, 41 BAC clones, whose DNA methylation status was able to discriminate pts who survived >4 yrs after hepatectomy from pts who suffered recurrence within 6 mos and died within a yr after hepatectomy, were identified./li>
The DNA methylation status of the 41 BAC clones was correlated with the cancer-free and overall survival rates of pts with HCC.
Multivariate analysis revealed that satisfying the criteria using the 41 BAC clones was an independent predictor of overall outcome.