Choose the correct answer. The aim of screening healthy people for cancer is to
ID: 3181592 • Letter: C
Question
Choose the correct answer. The aim of screening healthy people for cancer is to discover tumors when they are small and still treatable but sometimes this leads to unnecessary treatment because our bodies have a battery of mechanisms for stopping small tumors from becoming large. So treating would have been suppressed anyway does no good and can often be harmful according to some researchers. To assess the validity of these claims, a study was conducted to see whether the use of computerized tomography (CT) to detect tumors in the lungs has an effect on lung cancer survival. Two hundred healthy volunteers were randomly divided into two groups: one group of 100 was given a routine CT screening for lung cancer while the other was not. The subjects were followed for 10 years and the incidence of lung cancer for the two groups compared at that time. This study is an example of a A. Cohort study B. Sample survey C. Controlled experiment D. Case-referent study E. None of the above.Explanation / Answer
option A
finding causes of disease - the best available method
The cohort study design is the best available scientific method for measuring the effects of a suspected risk factor. While randomized controlled trials (RCT) are considered the best, most rigorous way of investigating interventional medicine, they are unethical for testing the causes of disease