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JNCI Journal of the National Cancer Institute 2004 96(2):148-152; doi:10.1093/jnci/djh010
© 2004 by Oxford University Press
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© 2004 Oxford University Press

BRIEF COMMUNICATION

Retention of Enrollees Following a Cancer Diagnosis Within Health Maintenance Organizations in the Cancer Research Network

Terry S. Field, Jackie Cernieux, Diana Buist, Ann Geiger, Lois Lamerato, Gene Hart, Don Bachman, Rick Krajenta, Sarah Greene, Mark C. Hornbrook, Gary Ansell, Lisa Herrinton, George Reed

Affiliations of authors: Meyers Primary Care Institute, Fallon Healthcare System (TSF, JC) and the University of Massachusetts Medical School (TSF, JC, GR), Worcester, MA; Center for Health Studies, Group Health Cooperative, Seattle, WA (DB, GH, SG); Department of Research and Evaluation, Southern California Permanente Medical Group, Pasadena, CA (AG); Henry Ford Health System, Detroit, MI (LL, RK); Center for Health Research, Kaiser Permanente Northwest, Portland, OR (DB, MCH, GA); Division of Research, Kaiser Permanente Northern California, Oakland, CA (LH).

Correspondence to: Terry S. Field, DSc, Meyers Primary Care Institute, 630 Plantation St., Worcester, MA 01605 (e-mail: terry.field{at}meyersprimary.org and terry.field{at}umassmed.edu)

Population laboratories with complete clinical information on episodes of care are needed to support research on the quality of care delivered to cancer patients. Data resources within the Cancer Research Network (CRN) may overcome many of the limitations of existing cancer databases, but their potential clinical value depends on the stability of the enrolled population. To assess this issue, we studied the retention rates among survivors of the 132 580 patients diagnosed with cancer from January 1, 1993, through December 31, 1998, who were enrolled at five health maintenance organization sites participating in the CRN. Enrollees were followed from cancer diagnosis through death, disenrollment, or the end of follow-up (i.e., December 31, 1999). The retention rate among survivors for all cancers combined at 1 and 5 years after cancer diagnosis was 96.0% (95% confidence interval [CI] = 95.9% to 96.1%) and 83.9% (95% CI = 83.4% to 84.3%), respectively. The proportion of enrollees diagnosed with cancer who remained enrolled and available for evaluation suggests that the CRN is well-suited for studies of the quality of care for cancer patients, survivorship, and long-term outcomes.


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