Abstract
Purpose
The long-term risks and benefits of radiotherapy for ductal carcinoma in situ (DCIS) remain unclear. Recent data from the Surveillance, Epidemiology and End Results (SEER) registries showed that DCIS-associated radiotherapy treatment significantly increased risk of second non-breast cancers including lung cancer. To help understand those observations and whether breast cancer risk factors are related to radiotherapy treatment decision-making, we examined associations between lifestyle and clinical factors with DCIS radiotherapy receipt.
Methods
Among 1628 participants from the NIH-AARP Diet and Health Study, diagnosed with incident DCIS (1995–2011), we examined associations between lifestyle and clinical factors with radiotherapy receipt. Radiotherapy and clinical information were ascertained from state cancer registries. Odds ratios (ORs) and 95% confidence intervals (CIs) for radiotherapy receipt (yes/no) were estimated from multivariable logistic regression.
Results
Overall, 45% (n = 730) received radiotherapy. No relationships were observed for most lifestyle factors and radiotherapy receipt, including current smoking (OR 0.97, 95%CI 0.70, 1.34). However positive associations were observed for moderate alcohol consumption and infrequent physical activity. The strongest associations were observed for radiotherapy receipt and more recent diagnoses (2005–2011 vs. 1995–1999; OR 1.60, 95%CI 1.14, 2.25), poorly versus well-differentiated tumors (OR 1.69, 95%CI 1.16, 2.46) and endocrine therapy (OR 3.37, 95%CI 2.56, 4.44).
Conclusions
Clinical characteristics were the strongest determinants of DCIS radiotherapy. Receipt was largely unrelated to lifestyle factors suggesting that the previously observed associations in SEER were likely not confounded by these lifestyle factors. Further studies are needed to understand mechanisms driving radiotherapy-associated second malignancies following DCIS, to identify prevention opportunities for this growing population.
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Data availability
The datasets analyzed during the current study were obtained from the National Cancer Institute. The data used in the present study are available following the submission of a proposal and upon approval from the NIH-AARP Steering Committee (https://dietandhealth.cancer.gov/). Researchers can access data from the NIH-AARP Diet and Health Study (https://dietandhealth.cancer.gov/) in the same manner as the authors.
Abbreviations
- ANOVA:
-
Analysis of variance analysis
- AARP:
-
Formerly American Association of Retired Persons
- CI:
-
Confidence interval
- DCIS:
-
Ductal carcinoma in situ
- NIH:
-
National Institutes of Health
- OR:
-
Odds ratios
- SEER:
-
Surveillance, Epidemiology and End Results
- US:
-
United States
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Acknowledgements
This research was supported [in part] by the Intramural Research Program of the NIH, National Cancer Institute. Cancer incidence data from the Atlanta metropolitan area were collected by the Georgia Center for Cancer Statistics, Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, Georgia. Cancer incidence data from California were collected by the California Cancer Registry, California Department of Public Health’s Cancer Surveillance and Research Branch, Sacramento, California. Cancer incidence data from the Detroit metropolitan area were collected by the Michigan Cancer Surveillance Program, Community Health Administration, Lansing, Michigan. The Florida cancer incidence data used in this report were collected by the Florida Cancer Data System (Miami, Florida) under contract with the Florida Department of Health, Tallahassee, Florida. The views expressed herein are solely those of the authors and do not necessarily reflect those of the FCDC or FDOH. Cancer incidence data from Louisiana were collected by the Louisiana Tumor Registry, Louisiana State University Health Sciences Center School of Public Health, New Orleans, Louisiana. Cancer incidence data from New Jersey were collected by the New Jersey State Cancer Registry, The Rutgers Cancer Institute of New Jersey, New Brunswick, New Jersey. Cancer incidence data from North Carolina were collected by the North Carolina Central Cancer Registry, Raleigh, North Carolina. Cancer incidence data from Pennsylvania were supplied by the Division of Health Statistics and Research, Pennsylvania Department of Health, Harrisburg, Pennsylvania. The Pennsylvania Department of Health specifically disclaims responsibility for any analyses, interpretations or conclusions. Cancer incidence data from Arizona were collected by the Arizona Cancer Registry, Division of Public Health Services, Arizona Department of Health Services, Phoenix, Arizona. Cancer incidence data from Texas were collected by the Texas Cancer Registry, Cancer Epidemiology and Surveillance Branch, Texas Department of State Health Services, Austin, Texas. Cancer incidence data from Nevada were collected by the Nevada Central Cancer Registry, Division of Public and Behavioral Health, State of Nevada Department of Health and Human Services, Carson City, Nevada. We are indebted to the participants in the NIH-AARP Diet and Health Study for their outstanding cooperation. We also thank Sigurd Hermansen and Kerry Grace Morrissey from Westat for study outcomes ascertainment and management and Leslie Carroll at Information Management Services for data support and analysis (https://dietandhealth.cancer.gov/acknowledgement.html).
Funding
This study was funded by the Intramural Research Program of the National Cancer Institute at the National Institutes of Health. MM was also funded in part by the Health Research Board in Ireland (Grant number: CPFPR-2013-1).
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MM, DRW, ABdG and GLG conceived and designed the study. MM, RMP, SF and REC oversaw statistical analysis. MM, DRW, REC, LML contributed to the drafting of the results. All authors substantially contributed to the preparation and critical review of the manuscript.
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The Special Studies Institutional Review Board (SSIRB) of the U.S. National Cancer Institute approved the NIH-AARP Diet and Health Study (Protocol Number: OH95CN025). This study was conducted in accordance with the ethical standards of the aforementioned institutional review board and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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10549_2019_5436_MOESM1_ESM.xlsx
Supplementary Table 1A: Sensitivity analysis for associations of patient characteristics with radiotherapy treatment among DCIS patients diagnosed within 5 years of completing the baseline questionnaire, NIH-AARP Cohort Study (1995-2011). Supplementary material 1 (XLSX 24 kb)
10549_2019_5436_MOESM2_ESM.xlsx
Supplementary Table 1B: Sensitivity analysis for associations of patient characteristics with radiotherapy treatment among DCIS patients diagnosed during or after 2000, NIH-AARP Cohort Study (1995-2011). Supplementary material 2 (XLSX 24 kb)
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Mullooly, M., Withrow, D.R., Curtis, R.E. et al. Association of lifestyle and clinical characteristics with receipt of radiotherapy treatment among women diagnosed with DCIS in the NIH-AARP Diet and Health Study. Breast Cancer Res Treat 179, 445–457 (2020). https://doi.org/10.1007/s10549-019-05436-0
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DOI: https://doi.org/10.1007/s10549-019-05436-0