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Carcinogenesis Advance Access originally published online on February 20, 2006
Carcinogenesis 2006 27(6):1266-1272; doi:10.1093/carcin/bgi356
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Specific TP53 mutation pattern in radiation-induced sarcomas

Nathalie Gonin-Laurent, Anne Gibaud, Mathilde Huygue, Sandrine H. Lefèvre, Morgane Le Bras 1, Laurent Chauveinc 2, Xavier Sastre-Garau 3, François Doz 4, Livia Lumbroso 5, Sylvie Chevillard 6 and Bernard Malfoy *

UMR7147 Institut Curie-CNRS-UPMC, CEA LRC38, 1 Génotoxicologie des Tumeurs, 2 Service de Radiothérapie, 3 Service de Pathologie, 4 Departement de Pédiatrie, 5 Service d'Ophtalmologie, Institut Curie, Paris and 6 CEA, DSV DRR, Fontenay-aux-Roses, France

* To whom correspondence should be addressed at: Institut Curie-CNRS, UMR7147. 26, rue d'Ulm, 75248 Paris Cedex 05, France. Tel: +33 1 42346685, Fax: +33 1 42346674; Email: bernard.malfoy{at}curie.fr

The mutagenic properties of ionizing radiation are well known, but the presence of specific mutations in human radiation-induced tumours is not established. We have studied a series of 36 secondary sarcomas arising in the irradiation field of a primary tumour following radiotherapy. The allelic status and the presence of mutations of the TP53 gene were investigated. The mutation pattern was compared with data from sporadic sarcomas recorded in the IARC TP53 somatic mutations database. A high proportion (58%) of the radiation-induced sarcomas exhibited a somatic inactivating mutation for one allele of TP53, systematically associated with a loss of the other allele. The high frequency (52%) of short deletions observed in the mutation pattern of radiation-induced sarcomas may be related to the induction of DNA breaks by ionizing radiation. The lack of hyper-reactivity of CpG dinucleotides and the presence of recurrent sites of mutation at codons 135 and 237 seem also to be specific for radiation tumorigenesis.


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