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Genomic landscape of small cell carcinoma of the breast contrasted to small cell carcinoma of the lung

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A Correction to this article was published on 11 October 2018

This article has been updated

Abstract

Small cell carcinoma of the breast is a rare, aggressive form of breast cancer that is associated with extremely poor outcomes [1]. In an effort to identify possible targets for treatment, we utilized comprehensive genomic profiling in small cell carcinoma of the breast. Under an IRB approved protocol, we identified patients with small cell carcinoma of the breast and small cell carcinoma of the lung profiled by Caris Life Sciences between 2007 and 2015. Tumors were assessed with up to 25 immunohistochemical stains, in situ hybridization of cMET, EGFR, HER2, PIK3CA, and TOP2A, and next generation sequencing as well as Sanger sequencing of 47 genes. 19 patients with small cell carcinoma of the breast were identified, median age was 58 years (range 37–79) and 42 % had metastatic disease at presentation; for comparison, 58 patients with small cell carcinoma of the lung were identified (66 [36–86], 65 % metastatic). By immunohistochemistry, 31 % of small cell carcinoma of the breast patients expressed ER, 13 % expressed PR, and 16 % expressed AR; small cell carcinoma of the lung patients expressed ER 0 %, PR 2 %, and AR 6 %. Small cell carcinoma of the breast and small cell carcinoma of the lung patients had similar patterns of other immunohistochemical expression (0 v 0 % PDL1, 50 v 42 % PD1, and 77 v 95 % TOP2A, respectively). All small carcinoma of the breast and small cell carcinoma of the lung patients were negative for HER2 and cMET amplification by in situ hybridization. Next generation sequencing revealed TP53 mutations in 75 % of patients both with small cell carcinoma of the breast and small cell carcinoma of the lung and PIK3CA mutations in 33 % of small cell carcinoma of the breast patients but no small cell carcinoma of the lung patients (Fisher’s exact test p = 0.005, OR 0.02 [0.00–0.52]). No other mutations were found in small cell carcinoma of the breast patients and no other mutation occurred in over 10 % of small cell carcinoma of the lung patients except RB1 in 19 % (p = 0.31). Small cell carcinoma of the breast is an aggressive tumor with few therapeutic options. Molecular profiling suggests many similarities between small cell carcinoma of the breast and small cell carcinoma of the lung with the exception an increased incidence of PIK3CA mutations in small cell carcinoma of the breast, which may have therapeutic implications.

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Change history

  • 11 October 2018

    In the original publication, the sixth author name was published incorrectly as Matthew Stein. The correct author name should read as Matthew K Stein.

  • 11 October 2018

    In the original publication, the sixth author name was published incorrectly as Matthew Stein. The correct author name should read as Matthew K Stein.

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Disclosures

Rebecca Feldman works for Caris Life Sciences.

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Authors and Affiliations

  1. University of Tennessee Health Science Center, Memphis, TN, USA

    Brennan McCullar, Manjari Pandey, George Yaghmour, Felicia Hare, Kruti Patel, Matthew Stein, Rebecca Feldman, Jason C. Chandler & Michael G. Martin

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  1. Brennan McCullar
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  2. Manjari Pandey
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  3. George Yaghmour
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  4. Felicia Hare
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  6. Matthew Stein
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  7. Rebecca Feldman
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  8. Jason C. Chandler
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  9. Michael G. Martin
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Correspondence to Brennan McCullar.

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McCullar, B., Pandey, M., Yaghmour, G. et al. Genomic landscape of small cell carcinoma of the breast contrasted to small cell carcinoma of the lung. Breast Cancer Res Treat 158, 195–202 (2016). https://doi.org/10.1007/s10549-016-3867-z

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  • DOI: https://doi.org/10.1007/s10549-016-3867-z

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