A multicenter pilot study examining the role of circulating tumor cells as a blood-based tumor marker in patients with extensive small-cell lung cancer.

Front Oncol · 2014 · PMC4196518 · PMID 25353007

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showed a trendno p-value reported

Our study only showed a trend between higher CTCs and percentage of change in post-treatment CTCs with worse outcome.

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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.