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The Role of Cross-Sectional and Cohort Studies in Oncology

  • André Lopes Carvalho
  • Fabiana de Lima Vazquez
  • Cleyton Zanardo de Oliveira
Chapter

Abstract

Cross-sectional and cohort studies are important epidemiological study designs in oncology. In cross-sectional studies, information on exposure is collected at the same time as information on outcome. In oncology these studies are mainly performed to measure the prevalence of an outcome. There is no follow-up period for the study participants; thus we cannot establish the causality or association between exposure and the subsequent development of the disease under investigation, because we cannot determine what has occurred first (exposure-disease/cause-effect). These studies generate hypotheses for further investigation.

Cohort studies, on the other hand, are studies in which, from a potential baseline cause (exposure) one investigates its effect (outcome). Therefore, these studies represent a very good design for evaluating causality. They can be prospective or retrospective, and the study population is divided into subgroups according to exposure characteristics (exposed and not-exposed). The study then assesses outcome after a given period of time, allowing the measurement of association (relative risk) for the outcome to be observed in the exposed and the not-exposed individuals. In oncology, cohort studies are mostly used to study risk factors or prognostic factors.

Keywords

Cross-sectional study Cohort study Exposure Outcome Risk factors Prognostic factors 

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • André Lopes Carvalho
    • 1
  • Fabiana de Lima Vazquez
    • 1
  • Cleyton Zanardo de Oliveira
    • 1
    • 2
  1. 1.Teaching and Research InstituteBarretos Cancer HospitalBarretosBrazil
  2. 2.Education and ResearchBP - A Beneficência Portuguesa de São PauloSão PauloBrazil

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