The first hurdle is a test's sensitivity. Sensitivity answers this question: What percentage of people with a given type of cancer will have their cancer detected when a given screening test is used? If a test is not very sensitive, there will be many "false negative" results, and persons with cancer will go undetected. A test that yields many false negatives will obviously not be very good at reducing cancer deaths, giving a false sense of security to people who actually have the disease.
![Importance of Diagnostic Test Sensitivity (cont.)](https://webarchive.library.unt.edu/eot2008/20090131033254im_/http://www.nci.nih.gov/images/Documents/abd6d05e-f179-4ec1-8376-6d4992583274/cancer33new2.jpg)
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