Journal Article

Measuring Disease-Free Survival and Cancer Relapse Using Medicare Claims From CALGB Breast Cancer Trial Participants (Companion to 9344)

Elizabeth B. Lamont, James E. Herndon, Jane C. Weeks, I. Craig Henderson, Craig C. Earle, Richard L. Schilsky and Nicholas A. Christakis

in JNCI: Journal of the National Cancer Institute

Volume 98, issue 18, pages 1335-1338
Published in print September 2006 | ISSN: 0027-8874
Published online September 2006 | e-ISSN: 1460-2105 | DOI:

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To determine the accuracy with which Medicare claims data measure disease-free survival in elderly Medicare beneficiaries with cancer, we performed a criterion validation study. We merged gold-standard clinical trial data of 45 elderly patients with node-positive breast cancer who were treated on the Cancer and Leukemia Group B (CALGB) adjuvant breast trial 9344 with Centers for Medicare and Medicaid Services (CMS) data files and compared the results of a CMS-based algorithm with the CALGB disease-free survival information to determine sensitivity and specificity. For 5-year disease-free survival, the sensitivity of the CMS-based algorithm was 100% (95% confidence interval [CI] = 81% to 100%), the specificity was 97% (95% CI = 83% to 100%), and the area under the receiver operator curve was 97% (95% CI = 90% to 100%). For 2-year disease-free survival, the test characteristics were less favorable: sensitivity was 83% (95% CI = 36% to 100%), specificity was 95% (95% CI = 83% to 100%), and area under the receiver operator curve was 84% (95% CI = 66% to 100%).

Journal Article.  3031 words. 

Subjects: Medical Oncology

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