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Long non-coding RNA HOTAIR is an independent prognostic marker of metastasis in estrogen receptor-positive primary breast cancer

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Abstract

Expression of HOX transcript antisense intergenic RNA (HOTAIR)—a long non-coding RNA—has been examined in a variety of human cancers, and overexpression of HOTAIR is correlated with poor survival among breast, colon, and liver cancer patients. In this retrospective study, we examine HOTAIR expression in 164 primary breast tumors, from patients who do not receive adjuvant treatment, in a design that is paired with respect to the traditional prognostic markers. We show that HOTAIR expression differs between patients with or without a metastatic endpoint, respectively. Survival analysis shows that high HOTAIR expression in primary tumors is significantly associated with worse prognosis independent of prognostic markers (P = 0.012, hazard ratio (HR) 1.747). This association is even stronger when looking only at estrogen receptor (ER)-positive tumor samples (P = 0.0086, HR 1.985). In ER-negative tumor samples, we are not able to detect a prognostic value of HOTAIR expression, probably due to the limited sample size. These results are successfully validated in an independent dataset with similar associations (P = 0.018, HR 1.825). In conclusion, our findings suggest that HOTAIR expression may serve as an independent biomarker for the prediction of the risk of metastasis in ER-positive breast cancer patients.

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Acknowledgments

This work was funded by the Danish Council for Independent Research (FSS), the Danish Ministry of Interior, University of Southern Denmark, The Danish Council for Strategic Research (DBCG-TIBCAT) Dansk Kræftforsknings Fond, Breast Friends, Fonden til Lægevidenskabens Fremme, Københavns Universitets Fond for Kræftforskning, Arkitekt H. Hjortenberg & hustrus D. Hjortenbergs Fond, Carl J. Beckers Fond, Grosserer A.V. Lykfeldts Legat, Tømrermester Jørgen Holm & hustru Elisa F. Hansens Midelegat and Meta & Håkon Baggers Fond. The authors thank Charlotte Skouboe Landré for technical assistance with RNA purification.

Conflict of interest

The authors declare that they have no conflicts of interest.

Ethics statement

The study was approved by the Danish Ethical Committee System (S-VF-20020142). The study was retrospective and we did not obtain informed consent from the patients involved in the study as approved by the Ethical Committee.

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Correspondence to Kristina P. Sørensen.

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Sørensen, K.P., Thomassen, M., Tan, Q. et al. Long non-coding RNA HOTAIR is an independent prognostic marker of metastasis in estrogen receptor-positive primary breast cancer. Breast Cancer Res Treat 142, 529–536 (2013). https://doi.org/10.1007/s10549-013-2776-7

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