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Oncology Abstracts (2019) 1 P025 | DOI: 10.1530/oncolabs.1.P025

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Estrogen receptor regulated miR-342 suppresses a pro-metastatic gene network

Rachael Lumb1, Victoria K Arnet1,2, Cameron N Johnstone3, Katherine A Pillman1, John Toubia1, Emily Hackett-Jones1, Caroline A Phillips1, Pannapa Pinweha1, Suraya Roslan1, Xiaochun Li1, Traude Beilharz4, Yeesim Khew-Goodall1, Gregory J Goodall1,2, Robin L Anderson3 & Philip A Gregory1,2

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1Centre for Cancer Biology – An Alliance between SA Pathology and the University of South Australia, Adelaide, SA, Australia; 2Discipline of Medicine, The University of Adelaide, Adelaide, SA, Australia; 3Olivia Newton-John Cancer Research Institute, Heidelberg, VIC, Australia; 4Department of Biochemistry and Molecular Biology, Monash University, Melbourne, Australia.


Breast cancer is the most frequently diagnosed cancer in women and the second leading cause of female cancer related death. Despite significant advances in early detection, surgery and therapy, treatment remains a challenge if metastatic disease develops. Metastasis occurs with high frequency in triple negative (ER/PR/HER2 negative, TNBC) breast cancers, which are a heterogeneous group of cancers with poor clinical outcome. We used an integrated approach to identify miRNAs that influence breast cancer metastasis as well as indicate patient outcome. Through this we identified miR-342 which we found is: (1) strongly downregulated in mouse and human TNBC cell lines that are prone to metastasise, (2) sufficient to repress breast cancer metastasis in immune competent and xenograft mouse models, and (3) an independent prognostic marker of patient outcome in large patient cohorts. Using genome-wide Argonaute-CLIP analysis we identified 120 direct target genes of miR-342, including a high representation of E2F1-driven and actin dynamics pathways. We propose these pathways may represent new targets for treatment of metastatic TNBC.

Volume 1

7th International Pacific Rim (PacRim) Breast and Prostate Cancer Meeting


17 Mar 2019 - 20 Mar 2019

PacRim Breast and Prostate Cancer Group 

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