Abstract
Breast cancer-related lymphedema (BCRL) is a serious chronic condition after breast cancer (BC) surgery and treatment. It is unclear if BCRL risk varies by race/ethnicity. In a multiethnic prospective cohort study of 2953 BC patients, we examined the association of self-reported BCRL status with self-reported race/ethnicity and estimated genetic ancestry. Hazard ratios (HR) and 95 % confidence intervals (CI) were calculated by multivariable Cox proportional hazards models, with follow-up starting 6 months post-BC diagnosis. Estimates were further stratified by body mass index (BMI). By 48 months of follow-up, 342 (11.6 %) women reported having BCRL. Younger age at BC diagnosis, higher BMI at baseline, and lower physical activity were associated with greater BCRL risk. African American (AA) women had a 2-fold increased risk of BCRL compared with White women (HR = 2.04; 95 % CI 1.35–3.08). African genetic ancestry was also associated with an increased risk (HR = 2.50; 95 % CI 1.43, 4.36). Both risks were attenuated but remained elevated after adjusting for known risk factors and became more pronounced when restricted to the nonobese women (adjusted HR = 2.31 for AA and HR = 3.70 for African ancestry, both p < 0.05). There was also evidence of increased BCRL risk with Hispanic ethnicity in the nonobese women. Nonobese AA women had a higher risk of BCRL than White women, which cannot be fully explained by known risk factors. This is the first large-scale, prospective study demonstrating differences in BCRL risk according to race/ethnicity as assessed by both self-report and genetic ancestry data, with a potential ancestry–obesity interaction.
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Abbreviations
- AA:
-
African American
- AIM:
-
Ancestry informative marker
- AJCC:
-
American Joint Committee on Cancer
- BC:
-
Breast cancer
- BCRL:
-
Breast cancer-related lymphedema
- BMI:
-
Body mass index
- CI:
-
Confidence interval
- HR:
-
Hazards ratio
- KPNC:
-
Kaiser Permanente Northern California
- MET:
-
Metabolic equivalent
- RPCI:
-
Roswell Park Cancer Institute
- SD:
-
Standard deviation
- SEER:
-
Surveillance, epidemiology, and end results program
- SES:
-
Socioeconomic status
- SLNB:
-
Sentinel lymph node biopsy
- WHR:
-
Waist-to-hip ratio
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Acknowledgments
The authors thank the office and field staff for data collection, processing, and preparation. The authors thank all the Pathways Study participants for their numerous contributions to this study. This work was supported by the National Cancer Institute at the National Institutes of Health (Grant Number: R01 CA105274 to L.H.K) and the American Cancer Society (Grant Number: RSG-06-209-01-LR to M.L.K). The Roswell Park Cancer Institute Data Bank and Biorepository and Genomics Shared Resource are supported by a National Cancer Institute Cancer Center Support Grant (Grant Number: P30 CA16056). The contents of this manuscript are solely the responsibility of the authors and do not necessarily represent the official views of the funding agencies.
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Marilyn L. Kwan and Song Yao contributed equally to this work and are co-first authors.
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Kwan, M.L., Yao, S., Lee, V.S. et al. Race/ethnicity, genetic ancestry, and breast cancer-related lymphedema in the Pathways Study. Breast Cancer Res Treat 159, 119–129 (2016). https://doi.org/10.1007/s10549-016-3913-x
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DOI: https://doi.org/10.1007/s10549-016-3913-x