Abstract
Background
Mammographic density (MD) varies throughout a woman’s life. We compared the performance of a fully automated (ImageJ-based) method to the observer-dependent Cumulus approach in the assessment of within-woman changes in MD over time.
Methods
MD was assessed in annual pre-diagnostic films (from age 40 to early 50s) from 313 breast cancer cases and 452 matched controls using Cumulus (left medio-lateral oblique (MLO) readings) and the ImageJ-based method (mean left–right MLO readings). Linear mixed models were used to compare within-woman changes in MD among controls. Associations between individual-specific MD trajectories and breast cancer were examined using conditional logistic regression.
Results
The age-related trajectories predicted by Cumulus and the ImageJ-based method were similar for all MD measures, except that the ImageJ-based method yielded slightly higher (by 2.54 %, 95 % CI 2.07 %, 3.00 %) estimates for percent MD. For both methods, the yearly rate of change in percent MD was twice faster after menopause than before, and higher BMI was associated with lower mean percent MD, but not associated with rate of change. Both methods yielded similar associations of individual-specific MD trajectories with breast cancer risk.
Conclusions
The ImageJ-based method is a valid fully automated alternative to Cumulus for measuring within-woman changes in MD in digitized films. The Age Trial is registered as an International Standard Randomized Controlled Trial, number ISRCTN24647151.
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Abbreviations
- BMI:
-
Body mass index
- BC:
-
Breast cancer
- CC:
-
Cranio-caudal
- CI:
-
Confidence interval
- IQR:
-
Inter-quartile range
- MD:
-
Mammographic density
- MLO:
-
Medio-lateral oblique
- PD:
-
Percent density
- SD:
-
Standard deviation
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Acknowledgments
We thank the participating National Health Services Breast Screening Programme (NHSBSP) centres for their help with the retrieval of the mammographic films for the study participants. This study was funded by project Grants from Breast Cancer Campaign (2007MayPR23) and Cancer Research UK (G186/11 and C405/A14565). The funding bodies had no role in the design of the study; in the collection, analysis, and interpretation of data; in the writing of the manuscript; or in the decision to submit the manuscript for publication. The development of ImageJ was supported by the second Joint Council Office (JCO) Career Development Grant (13302EG065). Jingmei Li is a UNESCO-L’Oréal International Fellow.
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Busana, M.C., De Stavola, B.L., Sovio, U. et al. Assessing within-woman changes in mammographic density: a comparison of fully versus semi-automated area-based approaches. Cancer Causes Control 27, 481–491 (2016). https://doi.org/10.1007/s10552-016-0722-9
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DOI: https://doi.org/10.1007/s10552-016-0722-9