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Survival and Treatment for Colorectal Cancer Medicare Patients in Two Group/Staff Health Maintenance Organizations and the Fee-for-Service Setting

Brigham Young University

Martin L. Brown

National Cancer Institute

Arnold L. Potosky

National Cancer Institute

Gerald Riley

Health Care Financing Administration

Stephen H. Taplin

Group Health Cooperative

William Barlow

Group Health Cooperative

Bruce H. Fireman

Kaiser Permanente

The current study compares treatment use and long-term survival in colorectal cancer patients between Medicare beneficiaries enrolled in two large prepaid group/staff health maintenance organizations (HMOs) and the fee-for-service (FFS) setting. The study is based on 15,352 colorectal cancer cases diagnosed between 1985 and 1992 and followed through 1995. Survival differences between the HMO and FFS cases were assessed using Cox regression. Treatment differences were evaluated using logistic regression. HMO cases had a lower overall mortality than did FFS cases but not a significantly lower colorectal cancer-specific mortality. Use of surgical resection was similar between HMO and FFS cases. However, rectal cancer cases in the HMOs were more likely to receive postsurgical radiation therapy than FFS cases. Superior overall survival in the HMOs may be the result of increased colorectal cancer screening, greater use of adjuvant therapies, and selection of healthier individuals.

Medical Care Research and Review, Vol. 56, No. 2, 177-196 (1999)
DOI: 10.1177/107755879905600204


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