Multiple chromosomal abnormalities in human liver (pre)neoplasia.

Area of Science:

• Hepatology
• Cancer Genetics
• Genomics

Background:

• The precise tumor precursor lesions and genetic aberration sequence in human hepatocarcinogenesis remain largely unknown.
• Understanding these early events is critical for identifying potential therapeutic targets and improving early detection strategies.

Purpose of the Study:

• To investigate the genetic alterations in various benign liver lesions and compare them with those found in hepatocellular carcinoma (HCC).
• To identify potential tumor precursor lesions and early genetic events in the development of HCC.

Main Methods:

• Comparative genomic hybridisation (CGH) was employed to analyze genetic alterations in 40 cases.
• The study included cirrhotic liver (CL), focal nodular hyperplasia (FNH), hepatocellular adenoma (HCA), dysplastic nodules (DNs), primary HCC, and lung metastases.

Main Results:

• Focal nodular hyperplasia and hepatocellular adenoma showed minimal chromosomal abnormalities.
• Dysplastic nodules exhibited a genetic alteration pattern highly similar to hepatocellular carcinoma, with frequent gains on 1p/q, 7q, 15q, 16p, 17q, 20q and losses on 3p, 4q, 9p, 11q.
• Specific aberrations on 1p, 6q, 8p/q, and 13q were predominantly found in HCC, including c-myc amplification at 8q.

Conclusions:

• The genetic profile of dysplastic nodules closely resembles that of HCC, strongly suggesting DNs as the direct tumor precursors.
• Genetic alterations at 4q, 9p, 11q, 16p, and 17q are identified as early, crucial events in hepatocarcinogenesis.