Abstract
To determine the frequency of Wnt/Wingless β catenin pathway alteration in human hepatocellular carcinoma, a β catenin and APC gene mutation screening was performed in a series of 119 tumors. An activating β catenin mutation in exon 3 was found in 18% of the cases. Among tumors lacking β catenin mutation, no APC mutation has been evidenced in a subset of 30 cases tested. The correlation between β catenin mutation status and chromosome segment deletions was studied on a set of 48 hyperploid tumors. Chromosome 1p, 4q and 16p deletions were significantly associated with the absence of β catenin mutation (P<0.05). Furthermore the Fractional Allelic Loss was significantly smaller in the β catenin mutated tumors than in the non-mutated tumors (0.12 versus 022). Taken together, these results suggest, the existence of two carcinogenesis mechanisms. The first mechanism implies a β catenin activating mutation associated with a low rate of loss of heterozygosity. The second mechanism, operating in a context of chromosomal instability, would involve tumor suppressor genes.
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Acknowledgements
We are very grateful to Claudia de Toma and Jean-Christophe Beaudoin for help in the APC and β catenin mutation screening. We thank Hélène Blons for helpful discussions and critical reading of the manuscript. This work was supported by the Association de la Recherche sur le Cancer and the Ministère de l'Education et de la Recherche.
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Legoix, P., Bluteau, O., Bayer, J. et al. Beta-catenin mutations in hepatocellular carcinoma correlate with a low rate of loss of heterozygosity. Oncogene 18, 4044–4046 (1999). https://doi.org/10.1038/sj.onc.1202800
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DOI: https://doi.org/10.1038/sj.onc.1202800
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