ERBB2 mutations associated with solid variant of high-grade invasive lobular breast carcinomas.
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| Abstract |
ERBB2 and ERBB3 somatic gain-of-function mutations, which may be targeted by anti-ERBB2 therapies, were reported by high-throughput sequencing studies in 1% and 2% of invasive breast cancers respectively. Our study aims to determine ERBB2 and ERBB3 mutations frequencies in grade 3 and/or ERBB2-positive invasive lobular breast carcinomas (ILC). All the 529 ILC surgically-excised registered at Institut Curie in the years 2005 to 2008 were reviewed. Thirty-nine grade 3 ERBB2-negative ILC and 16 ERBB2-positive ILC were retrieved and subjected to Sanger sequencing of the ERBB2 and ERBB3 activation mutation hotspots (ERBB2: exons 8, 17, 19, 20, 21; ERBB3: exons 3, 6, 7, 8). Among the 39 grade 3 ERBB2-negative ILC, six tumors were found to have at least one detectable ERBB2 activating mutation (incidence rate: 15%, 95%CI [4%-27%]). No ERBB2 mutation was found among the 16 ERBB2-positive ILC. No ERBB3 mutation was found in any of the 55 ILC. ERBB2 mutations were statistically associated with solid ILC features (p=0.01). Survival analyses showed no significant prognostic impact of ERBB2 mutations. Our study demonstrates that high grade ERBB2-negative ILC display a high frequency of ERBB2 mutations, and should be subjected to systematic genetic screening.
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| Authors | Gabrielle Deniziaut, Jean Christophe Tille, François-Clément Bidard, Sophie Vacher, Anne Schnitzler, Walid Chemlali, Laurence Trémoulet, Laetitia Fuhrmann, Paul Cottu, Roman Rouzier, Ivan Bièche, Anne Vincent-Salomon |
| Journal | Oncotarget (Oncotarget) Vol. 7 Issue 45 Pg. 73337-73346 (Nov 08 2016) ISSN: 1949-2553 [Electronic] United States |
| PMID | 27602491 (Publication Type: Journal Article) |
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