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Modeling and Validating the Cost and Clinical Pathway of Colorectal Cancer

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Listed:
  • Paal Joranger
  • Arild Nesbakken
  • Geir Hoff
  • Halfdan Sorbye
  • Arne Oshaug
  • Eline Aas

Abstract

Background. Cancer is a major cause of morbidity and mortality, and colorectal cancer (CRC) is the third most common cancer in the world. The estimated costs of CRC treatment vary considerably, and if CRC costs in a model are based on empirically estimated total costs of stage I, II, III, or IV treatments, then they lack some flexibility to capture future changes in CRC treatment. The purpose was 1) to describe how to model CRC costs and survival and 2) to validate the model in a transparent and reproducible way. Methods. We applied a semi-Markov model with 70 health states and tracked age and time since specific health states (using tunnels and 3-dimensional data matrix). The model parameters are based on an observational study at Oslo University Hospital (2049 CRC patients), the National Patient Register, literature, and expert opinion. The target population was patients diagnosed with CRC. The model followed the patients diagnosed with CRC from the age of 70 until death or 100 years. The study focused on the perspective of health care payers. Results. The model was validated for face validity, internal and external validity, and cross-validity. The validation showed a satisfactory match with other models and empirical estimates for both cost and survival time, without any preceding calibration of the model. Conclusions. The model can be used to 1) address a range of CRC-related themes (general model) like survival and evaluation of the cost of treatment and prevention measures; 2) make predictions from intermediate to final outcomes; 3) estimate changes in resource use and costs due to changing guidelines; and 4) adjust for future changes in treatment and trends over time. The model is adaptable to other populations.

Suggested Citation

  • Paal Joranger & Arild Nesbakken & Geir Hoff & Halfdan Sorbye & Arne Oshaug & Eline Aas, 2015. "Modeling and Validating the Cost and Clinical Pathway of Colorectal Cancer," Medical Decision Making, , vol. 35(2), pages 255-265, February.
    • Handle: RePEc:sae:medema:v:35:y:2015:i:2:p:255-265
    DOI: 10.1177/0272989X14544749
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    References listed on IDEAS

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    1. Briggs, Andrew & Sculpher, Mark & Claxton, Karl, 2006. "Decision Modelling for Health Economic Evaluation," OUP Catalogue, Oxford University Press, number 9780198526629.
    2. Ruth Etzioni & Scott D. Ramsey & Kristin Berry & Martin Brown, 2001. "The impact of including future medical care costs when estimating the costs attributable to a disease: a colorectal cancer case study," Health Economics, John Wiley & Sons, Ltd., vol. 10(3), pages 245-256, April.
    3. Aas, Eline, 2009. "Cost-effectiveness of screening for colorectal cancer with once-only flexible sigmoidoscopy and faecal occult blood test," HERO Online Working Paper Series 2008:6, University of Oslo, Health Economics Research Programme.
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