Abstract
Retrospective studies allow researchers to evaluate outcomes in a real-world setting at reduced costs compared with prospective trials, and have long-established use in surgical oncology. In retrospective studies, the study sample is generated from secondary or pre-existing data, which precludes randomization. As a result, the potential for unique and significant biases exists and these can limit the applicability and generalizability of the findings. This chapter is intended to serve as a guide for conducting retrospective research studies. Topics covered include internal and external validity; types of biases; sampling and matching techniques, including propensity score matching; missing data; and special considerations for common study designs. Examples from the surgical oncology literature are provided.
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Panageas, K.S., Goldman, D.A., Kingham, T.P. (2018). Design of Retrospective and Case-Control Studies in Oncology. In: Araújo, R., Riechelmann, R. (eds) Methods and Biostatistics in Oncology. Springer, Cham. https://doi.org/10.1007/978-3-319-71324-3_9
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