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A new virus in liver cancer

25 Aug 2015 | By Inserm (Newsroom) | Cancer

More than a cause of a simple infection, viruses are often involved in the development of serious diseases. Such is the case with liver cancer, which often develops in an organ that has been weakened by hepatitis B or C virus. Researchers at Inserm, the Paris Public Hospitals (AP-HP), Paris Descartes University, Paris 13 University (USPC), and Paris Diderot University have just identified the role of a new virus, hitherto unsuspected, in the occurrence of a rare type of liver cancer. 
This study, based on follow-up and observation of 193 patients, is published in the 24 August issue of Nature Genetics.

With over 8,000 new individuals diagnosed annually, liver cancer mainly affects men, and is a major cause of death worldwide. Among the different types of liver cancer, hepatocellular carcinoma usually occurs in a liver that has already been damaged by illness. The liver may, for example, have been weakened by excessive alcohol consumption, obesity, or chronic viral infection by hepatitis B or C viruses, which causes irreversible liver lesions leading to cirrhosis.

Cirrhosis patients generally undergo regular tests to detect cancer. However, in 5% of cases, liver cancer occurs in patients who had not reported cirrhosis, and the reason for developing the cancer remains to be identified.

Jessica Zucman-Rossi and her staff at Inserm Unit 1162, “Functional Genomics of Solid Tumors,” focused on these patients to determine the risk factors that had contributed to the development of their cancer.

In the genome of tumour cells of 11 patients, the scientists observed the insertion of a viral DNA segment from adeno-associated virus type 2, known as AAV2. This virus has been considered non-pathogenic for humans until now. In order to confirm the virus’s involvement in the cancer, the research team compared tumour tissues with normal tissues. They thus confirmed their hypothesis: the integration of viral DNA was found more often in tumour cells than in healthy cells in these 11 patients. Moreover, 8 of these patients did not have cirrhosis, and 6 of them presented no known risk factors for liver cancer.Expression de gènes

Hierarchical clustering analysis of the data of nominal chip expression of liver cancer DNA genes. ©Inserm/Zucman-Rossi, Jessica

By studying these malignant cells in greater detail, they discovered that the virus, when inserting its DNA into the genome of the patient’s cells, targets genes that are important in cell proliferation. Jessica Zucman-Rossi and her colleagues have shown that AAV2 leads to excessive expression of these genes which, according to the researchers, may favour tumour development.

By this work, the researchers have identified the involvement of AAV2 virus, previously thought to be harmless, in the occurrence of hepatocellular carcinoma, particularly in the rare cases of cancer that develop in the absence of cirrhosis and without an identified cause.

These results also call for caution: “AAV2 is often used as a vector in gene therapy. Although the insertion of its DNA into tumour promoting genes is rare, and probably a chance event, precautions must be taken regarding the use of this virus,” explain the authors.
This work was supported by the French National Cancer Institute (INCa) via ICGC and PAIR-CHC NoFLIC (with the participation of ARC Foundation) and the French National Cancer League. Tumour sequencing was performed by IntegraGen, in its laboratories located at Genopole, Evry.

Researcher Contact
Jessica Zucman-Rossi
PU-PH Université Paris Descartes
Directeur de l’Unité 1162 « Génomique fonctionnelle des tumeurs solides » (Inserm/ Université Paris Descartes / Université Paris 13 /Université Paris Diderot)
Service d’Oncologie Hôpital européen Georges Pompidou AP-HP
+ 33 (0) 1 53 72 51 66
Press Contact
Recurrent AAV2-related insertional mutagenesis in humanhepatocellular carcinomas Jean-Charles Nault*1,2,3,4,5,15, Shalini Datta*1,2,3,4,15, Sandrine Imbeaud*1,2,3,4,15, Andrea Franconi1,2,3,4, Maxime Mallet1,2,3,4, Gabrielle Couchy1,2,3,4, Eric Letouzé1,2,3,4, Camilla Pilati1,2,3,4, Benjamin Verret1,4, Jean-Frédéric Blanc6,7, Charles Balabaud7, Julien Calderaro1,2,3,4,8, Alexis Laurent9,10, Mélanie Letexier11, Paulette Bioulac-Sage7,12, Fabien Calvo1,2,3,4,13, Jessica Zucman-Rossi1,2,3,4,14 *Contribution égale 1 Inserm, UMR-1162, Génomique fonctionnelle des Tumeurs solides, Equipe Labellisée Ligue Contre le Cancer, Paris, F-75010 France 2 Université Paris Descartes, Labex Immuno-Oncology, Sorbonne Paris Cité, F-75010 Paris, France 3 Université Paris 13, Sorbonne Paris Cité, UFR SMBH, F-93000 Bobigny, France. 4 Université Paris Diderot, IUH, F-75010 Paris 5 APHP, Hôpitaux Universitaires Paris – Seine Saint-Denis, Site Jean Verdier, Pôle d’Activité Cancérologique Spécialisée, Service d’Hépatologie, F-93143 Bondy, France; 6 CHU de Bordeaux, Department of Hepatology, Hôpital Saint-André, Bordeaux, F-33076, France 7 Inserm, UMR-1053; Université de Bordeaux, Bordeaux, F-33076, France 8 Assistance Publique-Hôpitaux de Paris, Department of Pathology, CHU Henri Mondor, F-94000 Créteil, France. 9 Assistance Publique-Hôpitaux de Paris, Department of Digestive and Hepatobiliary Surgery, CHU Henri Mondor, F-94000 Créteil, France 10 Inserm, U955, F-94000 Créteil, France 11 IntegraGen, Evry, F-91000, France 12 CHU de Bordeaux, Pellegrin Hospital, Department of Pathology, Bordeaux, F-33076, France 13 Institut Gustave Roussy, Core Europe, Villejuif, F-94800, France 14 Assistance Publique-Hôpitaux de Paris, Hopital Europeen Georges Pompidou, F-75015 Paris, France 15 These authors contributed equally to this work Nature Genetics, 24 août 2015,