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Updated: Feb 15, 2026

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Human hepatocyte carcinogenesis (review).

Hidenori Shiraha1, Kazuhide Yamamoto, Masayoshi Namba

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Hepatocellular carcinoma (HCC) is a major global cancer. Understanding the genetic alterations in hepatocarcinogenesis, including tumor suppressor genes and oncogenes, is crucial for developing new therapies.

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Area of Science:

  • Hepatology and Oncology
  • Molecular Biology and Genetics

Background:

  • Hepatocellular carcinoma (HCC) is the third leading cause of cancer mortality globally, with increasing incidence rates.
  • Hepatocarcinogenesis, the process of HCC development, involves a stepwise accumulation of genetic alterations.
  • Key genetic changes include alterations in tumor suppressor genes, oncogenes, developmental pathways, and growth factor signaling.

Purpose of the Study:

  • To review the current understanding of genetic alterations in human hepatocarcinogenesis.
  • To highlight the established immortalized human hepatocyte cell lines as valuable research tools.
  • To emphasize the potential of these cell lines for studying the early stages of multistep hepatocarcinogenesis.

Main Methods:

  • Review of clinical and molecular medical analyses of hepatocarcinogenesis.
  • Classification of genetic changes in human HCC into four main groups: tumor suppressor genes, oncogenes, developmental pathways, and growth factors/receptors.
  • Discussion of the status of experimental models for human hepatocarcinogenesis, including established immortalized cell lines.

Main Results:

  • Identified four major categories of genetic alterations driving hepatocarcinogenesis: tumor suppressor genes (e.g., p53), oncogenes (e.g., K-ras), reactivation of developmental pathways (e.g., Wnt), and growth factor signaling.
  • Acknowledged the lack of a successful in vitro neoplastic transformation model for human hepatocytes.
  • Reported the establishment of several immortalized human hepatocyte cell lines.

Conclusions:

  • Established immortalized human hepatocyte cell lines represent promising experimental models for investigating hepatocarcinogenesis.
  • These cell lines are particularly valuable for elucidating the initial, critical steps in the multistep process of HCC development.
  • Further research using these models is essential for advancing our understanding and treatment of hepatocellular carcinoma.