External validation of a prognostic score predicting overall survival for patients with brain metastases based on extracranial factors.

Clin Transl Radiat Oncol · 2019 · PMC6411583 · PMID 30906886

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highly significantno p-value reported

The number of extracranial organ systems involved has also been found to be an independent and highly significant predictor of overall survival [7] , [8] .

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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.