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Article History

Received: 14 February 2017

Accepted: 29 January 2018

First Online: 27 February 2018

Ethics approval and consent to participate

: The study protocol was approved by the Science Ethics Committee of the Region Midtjylland in Denmark (M-20110198). The Science Ethics Committee of the Region Midtjylland in Denmark approved that informed consent for this study was not obtained; however, all women had the possibility to opt-out from research through the nation-wide registry. Tumor tissue of the women had been collected for diagnostic or therapeutic purposes around the time of breast cancer diagnosis. This tissue is stored in biobanks and may be used for research (‘secondary use’) as long as coded and anonymous to the researcher. No tissue was used against the will of the patients (women who opt-out with regard to tissue use for future scientific purposes were excluded (ExternalRef removed)); no risk was posed to the women as the tissue had already been removed; and tumor tissue and data were anonymous for the researcher“.

: Not applicable

: The authors declare that they have no competing interests.

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