Abstract
Purpose
The ability to collect data on patients for long periods prior to, during, and after a cancer diagnosis is critical for studies of cancer etiology, prevention, treatment, outcomes, and costs. We describe such data capacities within the Cancer Research Network (CRN), a cooperative agreement between the National Cancer Institute (NCI) and organized health care systems across the United States.
Methods
Data were extracted from each CRN site’s virtual data warehouse using a centrally written and locally executed program. We computed the percent of patients continuously enrolled ≥1, ≥5, and ≥10 years before cancer diagnosis in 2012–2015 (year varied by CRN site). To describe retention after diagnosis, we computed the cumulative percentages enrolled, deceased, and disenrolled each year after the diagnosis for patients diagnosed in 2000.
Results
Approximately 8 million people were enrolled in ten CRN health plans on December 31, 2014 or 2015 (year varied by CRN site). Among more than 30,000 recent cancer diagnoses, 70 % were enrolled for ≥5 years and 56 % for ≥10 years before diagnosis. Among 25,274 cancers diagnosed in 2000, 28 % were still enrolled in 2010, 45 % had died, and 27 % had disenrolled from CRN health systems.
Conclusions
Health plan enrollment before cancer diagnosis was generally long in the CRN, and the proportion of patients lost to follow-up after diagnosis was low. With long enrollment histories among cancer patients pre-diagnosis and low post-diagnosis disenrollment, the CRN provides an excellent platform for epidemiologic and health services research on cancer incidence, outcomes, and costs.


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Acknowledgments
This study was funded by the National Cancer Institute at the National Institutes of Health (NIH), Award Number U24CA171524 to Lawrence H. Kushi, ScD. The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH. At Group Health, the collection of cancer incidence data used in this study was supported by the Cancer Surveillance System of the Fred Hutchinson Cancer Research Center, which is funded by Contract Nos. N01-CN-67009 and N01-PC-35142 from the Surveillance, Epidemiology, and End Results (SEER) Program of the National Cancer Institute, with additional support from the Fred Hutchinson Cancer Research Center and the State of Washington. At Marshfield Clinic Research Foundation, the project was also supported in part by the Clinical and Translational Science Award (CTSA) program, through the NIH National Center for Advancing Translational Sciences (NCATS), Grant No. UL1TR000427. The authors would like to thank Dr. Virginia Quinn for comments on previous versions of the manuscript.
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Chubak, J., Ziebell, R., Greenlee, R.T. et al. The Cancer Research Network: a platform for epidemiologic and health services research on cancer prevention, care, and outcomes in large, stable populations. Cancer Causes Control 27, 1315–1323 (2016). https://doi.org/10.1007/s10552-016-0808-4
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DOI: https://doi.org/10.1007/s10552-016-0808-4