Serum erythropoietin levels, breast cancer and breast cancer-initiating cells.

Breast Cancer Res · 2019 · PMC6354373 · PMID 30700319

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showed a trendno p-value reported

Treatment of the cells with rhEpo showed a trend to enhance this phenomenon in vitro.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.