High mammographic density is associated with an increase in stromal collagen and immune cells within the mammary epithelium.

Breast Cancer Res · 2015 · PMC4485361 · PMID 26040322

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a nonsignificant trendno p-value reported

There was a nonsignificant trend for HMD tissue to have a mean 2 % higher Ki-67 expression than LMD tissue.

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