Microsatellite instability mutator phenotype in hepatocellular carcinoma in non-alcoholic and non-virally infected normal livers.
Microsatellite instability (MSI) seems to be a rare event in hepatocarcinogenesis and might actually be associated with the progression of hepatocellular carcinoma (HCC) in which the liver is often the site of chronic hepatitis or cirrhosis. The aim of this work was to define the MSI phenotype in HCC affecting exclusively normal livers to avoid slippage errors due to cirrhosis. One hundred and sixty-four patients with HCC affecting non-cirrhotic livers were operated on in our hospital between 1984 and 2001. We analyzed 37 patients selected for low alcohol consumption and the absence of HBV or HCV infection. All the livers were histologically normal. MSI was analyzed according to the criteria defined during the conference consensus workshop for colorectal cancer. High MSI (MSI-H > 30%) was found in 6 (16%) and low MSI (MSI-L < 30%) in 10 (27%) of the 37 HCCs. None of the 10 microsatellite markers tested were altered in the remaining 21 tumors (57%). Immunohistochemistry showed that normal amounts of hMLH1 and hMSH2 were present both in MSI-H and in MSI-L HCCs. MSI-H was significantly associated with more aggressive histological tumor features and a shorter median delay before recurrence. Thus, we have found a small subgroup of HCC tumors which can be considered as a new clinical/histological entity.
Chiappini
Franck
F
Service de Biochimie et Biologie Moléculaire, Hôpital Paul Brousse, Assistance Publique-Hôpitaux de Paris, France.
Gross-Goupil
Marine
M
Saffroy
Raphaël
R
Azoulay
Daniel
D
Emile
Jean-François
JF
Veillhan
Luc-Antoine
LA
Delvart
Valérie
V
Chevalier
Stephan
S
Bismuth
Henri
H
Debuire
Brigitte
B
Lemoine
Antoinette
A
D048868:Adaptor Proteins, Signal Transducing; D006528:Carcinoma, Hepatocellular / Q000235:genetics* / Q000601:surgery; D002352:Carrier Proteins; D015179:Colorectal Neoplasms / Q000235:genetics; D004260:DNA Repair / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics; D018572:Disease-Free Survival; D005355:Fibrosis / Q000150:complications; D005500:Follow-Up Studies; D006801:Humans; D008113:Liver Neoplasms / Q000235:genetics* / Q000601:surgery; D018895:Microsatellite Repeats / Q000235:genetics*; D000070957:MutL Protein Homolog 1; D051718:MutS Homolog 2 Protein; D016296:Mutagenesis; D009363:Neoplasm Proteins / Q000235:genetics; D009687:Nuclear Proteins; D011518:Proto-Oncogene Proteins / Q000235:genetics; D013997:Time Factors
D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins; D004268:DNA-Binding Proteins; C501486:MLH1 protein, human; D009363:Neoplasm Proteins; D009687:Nuclear Proteins; D011518:Proto-Oncogene Proteins; C497172:MSH2 protein, human; D000070957:MutL Protein Homolog 1; D051718:MutS Homolog 2 Protein