The ketogenic diet is an effective adjuvant to radiation therapy for the treatment of malignant glioma.

PLoS One · 2012 · PMC3341352 · PMID 22563484

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highly significantno p-value reported

Furthermore, we did see a highly significant increase in long term survival.

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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.