Frontiers in Oncology (May 2021)

Exome Sequencing in BRCA1-2 Candidate Familias: The Contribution of Other Cancer Susceptibility Genes

  • Gabriella Doddato,
  • Gabriella Doddato,
  • Floriana Valentino,
  • Floriana Valentino,
  • Annarita Giliberti,
  • Annarita Giliberti,
  • Filomena Tiziana Papa,
  • Filomena Tiziana Papa,
  • Rossella Tita,
  • Lucia Pia Bruno,
  • Lucia Pia Bruno,
  • Sara Resciniti,
  • Sara Resciniti,
  • Chiara Fallerini,
  • Chiara Fallerini,
  • Elisa Benetti,
  • Maria Palmieri,
  • Maria Palmieri,
  • Maria Antonietta Mencarelli,
  • Alessandra Fabbiani,
  • Alessandra Fabbiani,
  • Alessandra Fabbiani,
  • Mirella Bruttini,
  • Mirella Bruttini,
  • Alfredo Orrico,
  • Margherita Baldassarri,
  • Margherita Baldassarri,
  • Francesca Fava,
  • Francesca Fava,
  • Francesca Fava,
  • Diego Lopergolo,
  • Diego Lopergolo,
  • Diego Lopergolo,
  • Caterina Lo Rizzo,
  • Vittoria Lamacchia,
  • Vittoria Lamacchia,
  • Vittoria Lamacchia,
  • Sara Mannucci,
  • Sara Mannucci,
  • Sara Mannucci,
  • Anna Maria Pinto,
  • Aurora Currò,
  • Aurora Currò,
  • Aurora Currò,
  • Virginia Mancini,
  • Oncologic Multidisciplinary Team, Azienda Ospedaliera Universitaria Senese,
  • Oncologic Multidisciplinary Team, Azienda Usl Toscana Sud Est,
  • Francesca Mari,
  • Francesca Mari,
  • Francesca Mari,
  • Alessandra Renieri,
  • Alessandra Renieri,
  • Alessandra Renieri,
  • Francesca Ariani,
  • Francesca Ariani,
  • Francesca Ariani,
  • Alessandro Neri,
  • Donato Casella,
  • Andrea Bernini,
  • Stefania Marsili,
  • Roberto Petrioli,
  • Salvatora Tindara Miano,
  • Alessandra Pascucci,
  • Ignazio Martellucci,
  • Monica Crociani,
  • Marta Vannini,
  • Federica Fantozzi,
  • Andrea Stella,
  • Alessia Carmela Tripodi,
  • Angelamaria Giusti,
  • Alfonso Fausto,
  • Lucia Mantovani,
  • Francesca Belardi

DOI
https://doi.org/10.3389/fonc.2021.649435
Journal volume & issue
Vol. 11

Abstract

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Hereditary Breast and Ovarian Cancer (HBOC) syndrome is a condition in which the risk of breast and ovarian cancer is higher than in the general population. The prevalent pathogenesis is attributable to inactivating variants of the BRCA1-2 highly penetrant genes, however, other cancer susceptibility genes may also be involved. By Exome Sequencing (ES) we analyzed a series of 200 individuals selected for genetic testing in BRCA1-2 genes according to the updated National Comprehensive Cancer Network (NCCN) guidelines. Analysis by MLPA was performed to detect large BRCA1-2 deletions/duplications. Focusing on BRCA1-2 genes, data analysis identified 11 cases with pathogenic variants (4 in BRCA1 and 7 in BRCA1-2) and 12 with uncertain variants (7 in BRCA1 and 5 in BRCA2). Only one case was found with a large BRCA1 deletion. Exome analysis allowed to characterize pathogenic variants in 21 additional genes: 10 genes more traditionally associated to breast and ovarian cancer (ATM, BRIP1, CDH1, PALB2, PTEN, RAD51C, and TP53) (5% diagnostic yield) and 11 in candidate cancer susceptibility genes (DPYD, ERBB3, ERCC2, MUTYH, NQO2, NTHL1, PARK2, RAD54L, and RNASEL). In conclusion, this study allowed a personalized risk assessment and clinical surveillance in an increased number of HBOC families and to broaden the spectrum of causative variants also to candidate “non-canonical” genes.

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