Why Research on Screening and Early Detection Is Critical to Progress against Cancer
Some patients whose cancers are detected and treated early may have better long-term survival than patients whose cancers are not found until symptoms appear. Unfortunately, effective screening tests for early detection do not exist for many cancers. And, for cancers for which there are widely used screening tests, many of the tests have not proven effective in reducing cancer mortality.
from Cancer Information - Cancer Screening and Early Detection Research
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