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Interactions between Body Mass Index and Hormone Therapy and Postmenopausal Breast Cancer Risk (United States)

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Abstract

Objective

To assess interactions between use of estrogen plus progestin hormone therapy (EPHT) and body mass index (BMI) in relation to risks of different types of breast cancer, based on histology and hormone receptor status.

Methods

We conducted a population-based case-control study that compared 975 postmenopausal breast cancer cases to 1,007 controls. Interactions between menopausal hormone therapy (HT) and BMI in relation to risk of different breast cancer types were evaluated using logistic regression.

Results

Obese (BMI ≥30.0 kg/m2) never users of HT had 1.7–fold to 2.3–fold elevated risks of ductal and ER+/PR+ tumors, respectively, compared to thinner women. BMI was not related to breast cancer risk among current HT users. Current EPHT users for ≥5 years had 2.1 to 9.6-fold elevated risks of lobular and ER+/PR+ tumors compared to never users of HT regardless of BMI. Current EPHT users for ≥5 years with a BMI ≤24.9 kg/m2 also had a 2.6-fold elevated risk of ductal carcinoma. However, none of the interactions between BMI and HT use evaluated reached statistical significance.

Conclusions

While interactions between HT and BMI are well established, they appear to only be present among certain breast cancer types. Since obesity is related to breast cancer risk only among never users of HT, as HT use declines the relative impact of obesity on breast cancer incidence may grow.

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Acknowledgements

This study was supported by the National Cancer Institute (NCI), through a contract with Fred Hutchinson Cancer Research Center (RO1 CA072787).

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Authors and Affiliations

  1. Fred Hutchinson Cancer Research Center, Division of Public Health Sciences, 1100 Fairview Avenue North, M4-C308, 19024, Seattle, Washington, 98109-1024, USA

    Christopher I. Li, Kathleen E. Malone & Janet R. Daling

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  1. Christopher I. Li
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  2. Kathleen E. Malone
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  3. Janet R. Daling
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Correspondence to Christopher I. Li.

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Li, C.I., Malone, K.E. & Daling, J.R. Interactions between Body Mass Index and Hormone Therapy and Postmenopausal Breast Cancer Risk (United States). Cancer Causes Control 17, 695–703 (2006). https://doi.org/10.1007/s10552-005-0001-7

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  • DOI: https://doi.org/10.1007/s10552-005-0001-7

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