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Cancer Res 67, 6 (2007) 2611-6
Association of CYP1B1 Germ Line Mutations with Hepatocyte Nuclear Factor 1{alpha}-Mutated Hepatocellular Adenoma.
Emmanuelle Jeannot 1, 2, Karine Poussin 1, 2, Laurence Chiche 3, Yannick Bacq 4, Nathalie Sturm 5, Jean-Yves Scoazec, Catherine Buffet 6, Jeanne Tran Van Nhieu 7, Christine Bellanné-Chantelot 8, Claudia de Toma 2, Pierre Laurent-Puig 9, Paulette Bioulac-Sage 10, Jessica Zucman-Rossi ( ) 1
(15/03/2007)

Biallelic somatic mutations of TCF1 coding for hepatocyte nuclear factor 1alpha (HNF1alpha) are found in 50% of the hepatocellular adenoma (HCA) cases usually associated with oral contraception. In rare cases, HNF1alpha germ line mutations could also predispose to familial adenomatosis. In order to identify new genetic factors predisposing to HNF1alpha-mutated HCA, we searched for mutations in genes involved in the metabolism of estrogen. For 10 genes (CYP1A1, CYP1A2, CYP3A4, CYP3A5, COMT, UGT2B7, NQO1, GSTM1, GSTP1, and GSTT1), we did not find mutations nor differences in the allele distribution among 32 women presenting HNF1alpha-mutated adenomas compared with 58 controls. In contrast, we identified a CYP1B1 germ line heterozygous mutation in 4 of 32 women presenting HNF1alpha-mutated adenomas compared with none in 58 controls. We confirmed these results with the identification of four additional CYP1B1 mutations in a second series of 26 cases. No mutations were found in the control group, which was extended to 98 individuals, and only a known rare genetic variant was observed in two controls (P = 0.0003). We did an ethoxyresorufin O-deethylase assay to evaluate the functional consequence of the CYP1B1 mutations. We found reduced enzymatic activity in each CYP1B1 variant. In addition, an E229K CYP1B1 mutation was found in a woman with a germ line HNF1alpha mutation in a familial adenomatosis context. In this large family, all three patients with adenomatosis bore both HNF1 and CYP1B1 germ line mutations. In conclusion, our data suggested that CYP1B1 germ line-inactivating mutations might increase the incidence of HCA in women with HNF1alpha mutations. [Cancer Res 2007;67(6):2611-6].
1 :  Genomique Fonctionnelle des Tumeurs Solides
INSERM : U674 – Université Paris VII - Paris Diderot – IFR105
2 :  Centre d'Etude du Polymorphisme Humain (CEPH)
Institut Universitaire d'Hématologie – Fondation Jean Dausset – Université Paris VII - Paris Diderot
3 :  Service de chirurgie
CHU Caen
4 :  Service de gastro-entérologie
Hôpital Armand Trousseau – Assistance publique - Hôpitaux de Paris (AP-HP) – Université Pierre et Marie Curie (UPMC) - Paris VI
5 :  Laboratoire de Pathologie Cellulaire
CHU Grenoble
6 :  Service d'hépato-gastro-entérologie
Assistance publique - Hôpitaux de Paris (AP-HP) – Hôpital Bicêtre – Université Paris XI - Paris Sud
7 :  Service d'anatomie et cytologie pathologiques [Mondor]
Assistance publique - Hôpitaux de Paris (AP-HP) – Hôpital Henri Mondor – Université Paris-Est Créteil Val-de-Marne (UPEC)
8 :  Service de Cytogénétique
Assistance publique - Hôpitaux de Paris (AP-HP) – Hôpital Saint-Antoine – Université Pierre et Marie Curie (UPMC) - Paris VI
9 :  Bases moléculaires de la réponse aux xénobiotiques
INSERM : U775 – CNRS : IFR95 – Université Paris V - Paris Descartes
10 :  Fibrose hépatique et cancer du foie
INSERM : U889 – Université Victor Segalen - Bordeaux II – IFR66
Sciences du Vivant/Médecine humaine et pathologie/Hépatologie et Gastroentérologie
CYP1B1 – cytochrome P450 – hepatocellular adenoma – tumor suppressor gene – mutation – genetic predisposition – estrogen – metabolism
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