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Somatic mutations in salivary duct carcinoma and potential therapeutic targets


BACKGROUND: Salivary duct carcinomas (SDCa) are rare highly aggressive malignancies. Most patients die from distant metastatic disease within three years of diagnosis. There are limited therapeutic options for disseminated disease. RESULTS: 11 cases showed androgen receptor expression and 6 cases showed HER2 amplification. 6 Somatic mutations with additional available targeted therapies were identified: EGFR (p.G721A: Gefitinib), PDGFRA (p.H845Y: Imatinib and Crenolanib), PIK3CA (p.H1047R: Everolimus), ERBB2 (p.V842I: Lapatinib), HRAS (p.Q61R: Selumetinib) and KIT (p.T670I: Sorafenib). Furthermore, alterations in PTEN, PIK3CA and HRAS that alter response to androgen deprivation therapy and HER2 inhibition were also seen. MATERIALS AND METHODS: Somatic mutation analysis was performed on DNA extracted from 15 archival cases of SDCa using the targeted Illumina TruSeq Amplicon Cancer Panel. Potential targetable genetic alterations were identified using extensive literature and international somatic mutation database (COSMIC, KEGG) search. Immunohistochemistry for androgen receptor and immunohistochemistry and fluorescent in situ hybridization for HER2 were also performed. CONCLUSIONS: SDCa show multiple somatic mutations, some that are amenable to pharmacologic manipulation and others that confer resistance to treatments currently under investigation. These findings emphasize the need to develop testing and treatment strategies for SDCa.

Type Journal
ISBN 1949-2553 (Electronic) 1949-2553 (Linking)
Authors Khoo, T. K.; Yu, B.; Smith, J. A.; Clarke, A. J.; Luk, P. P.; Selinger, C. I.; Mahon, K. L.; Kraitsek, S.; Palme, C.; Boyer, M. J.; Dinger, M. E.; Cowley, M. J.; O'Toole, S. A.; Clark, J. R.; Gupta, R.
Responsible Garvan Author Prof Sandra O'Toole
Publisher Name Oncotarget
Published Date 2017-05-25
Published Volume 8
Published Issue 44
Published Pages 75893-75903
Status Published in-print
DOI 10.18632/oncotarget.18173
URL link to publisher's version