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- W2110264549 abstract "Abstract Second malignant neoplasms (SMN) are therapy-induced malignancies and a growing problem in cancer survivors, particularly survivors of childhood cancers. The lack of experimental models of SMNs has limited understanding of their pathogenesis. It is currently not possible to predict or prevent this devastating late complication. Individuals with neurofibromatosis I (NF1) are at increased risk of developing therapy-induced cancers for unclear reasons. To model SMNs, we replicated clinical radiotherapy and delivered fractionated abdominal irradiation to Nf1+/− and wild-type mice. Similar to irradiated cancer survivors, irradiated wild-type and Nf1+/− mice developed diverse in-field malignancies. In Nf1+/− mice, fractionated irradiation promoted both classical NF1-associated malignancies and malignancies unassociated with the NF1 syndrome but typical of SMNs. Nf1 heterozygosity potentiated the mutagenic effects of irradiation, as evidenced by the significantly reduced survival after irradiation and tumor development that was often characterized by synchronous primary tumors. Interestingly, diverse radiation-induced tumors arising in wild-type and Nf1+/− mice shared a genetic signature characterized by monoallelic loss of Nf1 and the adjacent Trp53 allele. These findings implicate Nf1 loss as mediating tumorigenesis in a broad range of cell types and organs extending beyond the classical NF1 tumor histologies. Examining clinical SMN samples, we found LOH of NF1 in SMNs from non-NF1 patients. Nf1 heterozygosity confers broad susceptibility to genotoxin-induced tumorigenesis, and this paradigm serves as an experimental platform for future studies of SMNs. Cancer Res; 72(24); 6425–34. ©2012 AACR." @default.
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- W2110264549 date "2012-12-15" @default.
- W2110264549 modified "2023-10-16" @default.
- W2110264549 title "Genetically Mediated <i>Nf1</i> Loss in Mice Promotes Diverse Radiation-Induced Tumors Modeling Second Malignant Neoplasms" @default.
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- W2110264549 doi "https://doi.org/10.1158/0008-5472.can-12-1728" @default.
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