The utility of Ki-67 as a prognostic biomarker in pulmonary neuroendocrine tumours: protocol for a systematic review and meta-analysis.

BMJ Open · 2019 · PMC6720315 · PMID 31446421

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may be significantno p-value reported

It is anticipated that there may be significant interstudy heterogeneity in how results will be reported, the cut-off points for Ki-67 percentage or other issues.

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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.