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Published in: Breast Cancer Research and Treatment 2/2020

01-09-2020 | Mammography | Epidemiology

“Are changes in breast density during the menstrual cycle relevant? To what?”

Authors: Jean L. Browne, Natalie Korsun, Lilian Casas, Ignacio Rodriguez, Beatriz Valero, Andreina Rincon, M. Angela Pascual

Published in: Breast Cancer Research and Treatment | Issue 2/2020

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Abstract

Purpose

Cancers can be hidden by high breast density (BDen)- the masking effect (ME). BDen is also a modifiable and highly prevalent breast cancer risk (BCR) factor. The purposes of this study were to determine how much glandular volume (GVol), breast volume (BVol) and their ratio: BDen change during the menstrual cycle, and if these changes could affect ME or be relevant to results of interventional studies aiming to diminish BCR using these parameters as surrogates.

Methods

We retrieved GVol, BVol and BDen data values obtained from 39,997 right mammograms performed with photon counting technique of 19,904 premenopausal women who reported their first day of last menses (FDLM). Many women had more than one study included over the years (with a different FDLM) but were not studied longitudinally. We segregated women by age (yearly), divided the menstrual cycle in 4 weeks, and assigned results with respect to the FDLM.

Results

All parameters vary cyclically, with higher values in week 4 (GVol and BDen) or week 1 (BVol). Mean inter-week differences were very small for the three parameters, and diminished with age. However, especially in the youngest women, inter-week differences could be more than 10% for BDen, 15% for GVol, and 50% for BVol.

Conclusion

Small inter-week mean differences almost certainly rule out relevant changes to ME directly attributable to BDen. However, the possibility of large differences during the menstrual cycle in younger women, who are the ideal targets of interventional studies to diminish BCR, might distort results and should be accounted for.
Literature
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go back to reference Nyante SJ, Sherman ME, Pfeiffer RM, Berrington De Gonzalez A, Brinton LA, AielloBowles EJ, Hoover RN, Glass A, Gierach GL (2015) Prognostic significance of mammographic density change after initiation of tamoxifen for ER-positive breast cancer. J Natl Cancer Inst 107(3):425. https://doi.org/10.1093/jnci/dju425 CrossRef Nyante SJ, Sherman ME, Pfeiffer RM, Berrington De Gonzalez A, Brinton LA, AielloBowles EJ, Hoover RN, Glass A, Gierach GL (2015) Prognostic significance of mammographic density change after initiation of tamoxifen for ER-positive breast cancer. J Natl Cancer Inst 107(3):425. https://​doi.​org/​10.​1093/​jnci/​dju425 CrossRef
Metadata
Title
“Are changes in breast density during the menstrual cycle relevant? To what?”
Authors
Jean L. Browne
Natalie Korsun
Lilian Casas
Ignacio Rodriguez
Beatriz Valero
Andreina Rincon
M. Angela Pascual
Publication date
01-09-2020
Publisher
Springer US
Published in
Breast Cancer Research and Treatment / Issue 2/2020
Print ISSN: 0167-6806
Electronic ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-020-05788-y

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