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Qualitative age interactions (or effect modification) suggest different cancer pathways for early-onset and late-onset breast cancers

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Abstract

Background

Prior to 1999–2000, breast cancer incidence rates had risen for decades, though more among older than younger women.

Materials and methods

To further explore the impact of advancing age-at-diagnosis upon breast cancer incidence, we used the National Cancer Institute’s Surveillance, Epidemiology, and End Results (SEER) program (1974–2003).

Results

Over time, we observed age interactions by tumor grade, stage, and race. For example, among women ages <40 years, high-grade lesions were more common than low-grade tumors for all time periods. Among women ages 40+ years, high-grade lesions were more common during early time periods then trend lines crossed, after which low-grade tumors were more common than high-grade lesions. Notably, the transition (crossover point) occurred earlier with advancing age-at-diagnosis.

Conclusion

The reversal (crossing) of incidence rates from high to low-grade tumors among women 40+ years is a qualitative age interaction, probably due to changing age-related risk factor and/or screening patterns, where mammography preferentially detected tumors of low malignant potential among older women. Though once thought to be rare or artifactual, qualitative age interactions suggest breast cancer heterogeneity. Indeed, if real, qualitative age interactions (effect modifications) imply different etiologic pathways for early-onset and late-onset types of breast cancer.

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Acknowledgments

This research was supported in part by the Intramural Research Program of the NIH/National Cancer Institute.

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Authors and Affiliations

  1. Biostatistics Branch, DHHS/NIH/NCI/DCEG, EPS, Room 8036, 6120 Executive Blvd, Bethesda, MD, 20892-7244, USA

    William F. Anderson, Bingshu E. Chen & Susan S. Devesa

  2. Hormonal and Reproductive Epidemiology Branch, DHHS/NIH/NCI/DCEG, Bethesda, MD, USA

    Louise A. Brinton

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  1. William F. Anderson
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  2. Bingshu E. Chen
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  4. Susan S. Devesa
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Correspondence to William F. Anderson.

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Anderson, W.F., Chen, B.E., Brinton, L.A. et al. Qualitative age interactions (or effect modification) suggest different cancer pathways for early-onset and late-onset breast cancers. Cancer Causes Control 18, 1187–1198 (2007). https://doi.org/10.1007/s10552-007-9057-x

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  • DOI: https://doi.org/10.1007/s10552-007-9057-x

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