Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9905873 | European Journal of Cancer | 2005 | 11 Pages |
Abstract
Reproductive factors affect breast cancer risk, but less is known of their associations with mammographic density and whether these differ by menopausal status. We report on a cross-sectional study of 1946 pre- and 3047 post-menopausal women who joined a breast screening programme in Northern Greece during 1993-1997. The odds of having a high-density Wolfe pattern (P2/DY) was inversely associated with age (P for linear trend <0.001) in both pre- and post-menopausal women and, for post-menopausal women, with years since menopause (PÂ <Â 0.001). The odds of a P2/DY pattern declined with higher parity (PÂ <Â 0.001) and younger age at first pregnancy (PÂ =Â 0.05) in both pre- and post-menopausal women. They also decreased with the duration of breast-feeding in pre-menopausal women (PÂ =Â 0.03 in pre- and PÂ =Â 0.69 in post-menopausal women; test for interaction with menopausal status: PÂ =Â 0.07). Age at menarche, age at menopause and the number of miscarriages/abortions were not associated with mammographic density. Age at first pregnancy and parity were strong correlates of mammographic density in pre- and post-menopausal women while duration of breast-feeding appeared to be particularly important in pre-menopausal women.
Keywords
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Cancer Research
Authors
Elena Riza, Isabel dos Santos Silva, Bianca De Stavola, Nicholas Perry, Efi Karadedou-Zafiriadou, Dimitrios Linos, Dionysios-Dennis Remoundos, Athena Linos,