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Title: Estimating the proportion cured of cancer: Some practical advice for users
Authors: Yu XQ; De Angelis R; Andersson TM; Lambert PC; O'Connell DL; Dickman PW
Categories: Cancer Type - All Cancers combined
Cancer Control, Survivorship, and Outcomes Research - Resources and Infrastructure
Keywords: Aged; Public Health; relative survival; survival; Wales; Australia; breast; cancer; Colon; Female; methods; New South Wales; Other
Year: 2013
Journal Title: Cancer Epidemiology
Volume: 37
Issue: 6
Page number start: 836
Page number end: 842
Abstract: BACKGROUND: Cure models can provide improved possibilities for inference if used appropriately, but there is potential for misleading results if care is not taken. In this study, we compared five commonly used approaches for modelling cure in a relative survival framework and provide some practical advice on the use of these approaches. PATIENTS AND METHODS: Data for colon, female breast, and ovarian cancers were used to illustrate these approaches. The proportion cured was estimated for each of these three cancers within each of three age groups. We then graphically assessed the assumption of cure and the model fit, by comparing the predicted relative survival from the cure models to empirical life table estimates. RESULTS: Where both cure and distributional assumptions are appropriate (e.g., for colon or ovarian cancer patients aged <75 years), all five approaches led to similar estimates of the proportion cured. The estimates varied slightly when cure was a reasonable assumption but the distributional assumption was not (e.g., for colon cancer patients >/=75 years). Greater variability in the estimates was observed when the cure assumption was not supported by the data (breast cancer). CONCLUSIONS: If the data suggest cure is not a reasonable assumption then we advise against fitting cure models. In the scenarios where cure was reasonable, we found that flexible parametric cure models performed at least as well, or better, than the other modelling approaches. We recommend that, regardless of the model used, the underlying assumptions for cure and model fit should always be graphically assessed
Programme: Health Services Research
Division: Cancer Research Division
DOI: 10.1016/j.canep.2013.08.014
URI: http://researchpubs.cancercouncil.com.au/cancercounciljspui/handle/1/1595
Appears in Collections:Research Articles

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