Infantile fibrosarcoma with TPM3-NTRK1 fusion in a boy with Bloom syndrome
AuthorsHuson, S. M.
Evans, D. G.
AffiliationDepartment of Genetic Medicine, St Mary's Hospital, Central Manchester Foundation Trust, Manchester, UK.
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AbstractBloom syndrome (BS) is a genomic and chromosomal instability disorder with prodigious cancer predisposition caused by pathogenic variants in BLM. We report the clinical and genetic details of a boy who first presented with infantile fibrosarcoma (IFS) at the age of 6 months and subsequently was diagnosed with BS at the age of 9 years. Molecular analysis identified the pathogenic germline BLM sequence variants (c.1642C>T and c.2207_2212delinsTAGATTC). This is the first report of IFS related to BS, for which we show that both BLM alleles are maintained in the tumor and demonstrate a TPM3-NTKR1 fusion transcript in the IFS. Our communication emphasizes the importance of long-term follow up after treatment for pediatric neoplastic conditions, as clues to important genetic entities might manifest later, and the identification of a heritable tumor predisposition often leads to changes in patient surveillance and management.
CitationHuson SM, Staab T, Pereira M, Ward H, Paredes R, Evans DG, et al. Infantile fibrosarcoma with TPM3-NTRK1 fusion in a boy with Bloom syndrome. Fam Cancer. 2020.