Ovarian carcinoma subtypes are different diseases: implications for biomarker studies.

PLoS Med · 2008 · PMC2592352 · PMID 19053170

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showed a trendno p-value reported

Three markers (PR, p53, K-Cadherin) showed a trend towards differential expression in low-grade versus high-grade serous subtypes.

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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.