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Medical Decision Making
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Implications of Cancer Staging Uncertainties in Radiation Therapy Decisions

Robert C. Lee, MSc

University of Calgary, Alberta Cancer Board, rclee{at}ucalgary.ca

Edidiong Ekaette, MSc

University of Calgary, Alberta Cancer Board

Karie-Lynn Kelly, MD

University of Calgary, Alberta Cancer Board

Peter Craighead, MD

University of Calgary, Alberta Cancer Board

Chris Newcomb, PhD

University of Calgary, Alberta Cancer Board

Peter Dunscombe, PhD

University of Calgary, Alberta Cancer Board

Introduction. Radiation therapy (RT) for cancer is a critical medical procedure that occurs in a complex environment involving numerous health professionals, hardware, software, and equipment. Uncertainties and potential incidents can lead to inappropriate administration of radiation to patients, with sometimes catastrophic consequences such as premature death or appreciably impaired quality of life. The authors evaluate the impact of incorrectly staging (i.e., estimation of extent of cancer) breast cancer patients and resulting inappropriate treatment decisions.Methods. The authors employ analytic and simulation methods in an influence-diagram framework to estimate the probability of incorrect staging and treatment decisions. As inputs, they use a combination of literature information on the accuracy and precision of pathology and tests as well as expert judgment. Sensitivity and value-of-information analyses are conducted to identify important uncertainties.Results and conclusions. The authors find a small but nontrivial probability that breast cancer patients will be incorrectly staged and thus may be subjected to inappropriate treatment. Results are sensitive to a number of variables, and some routinely used tests for metastasis have very limited information value. This work has implications for the methods used in cancer staging, and the methods are generalizable for quantitative risk assessment of treatment errors.

Key Words: patient safety • breast cancer • radiation • risk analysis

Medical Decision Making, Vol. 26, No. 3, 226-238 (2006)
DOI: 10.1177/0272989X06288684
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