Choose the correct answer. The aim of screening healthy people for cancer is to

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 those that would have been 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. The researchers obtained random sample of cancer patients whose disease had been detected by routine screening, and a random sample of cancer patients whose disease had not been detected by routine screening and compared the survival time after diagnosis for the groups. This study is an example of a A. Case-referent study B. Controlled experiment C. Sample survey D. Cohort study E. None of the above.

Explanation / Answer

This study is an example of a ( A ) Case - referent study .

Reason : A typical case-referent study selects cases with a certain disease—for example, asthma—from a hospital register or in a population survey . In this example also , we have obtained a sample of cancer patients from a population of cancer patients . That is why it is a case - referent study .

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