Radiation to supraclavicular and internal mammary lymph nodes in breast cancer increases the risk of stroke.

Br J Cancer · 2009 · PMC2653766 · PMID 19259096

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a significant trendno p-value reported

However, for IMC and SCL, there was a significant trend for higher risk of stroke with increasing daily fraction dose, especially marked for high doses (⩾4 Gy).

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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.