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In page Cancer:

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Some slow-growing cancers are particularly common, but often are not fatal. Autopsy studies in Europe and Asia showed that up to 36% of people have undiagnosed and apparently harmless thyroid cancer at the time of their deaths and that 80% of men develop prostate cancer by age 80.[12][13] As these cancers do not cause the patient's death, identifying them would have represented overdiagnosis rather than useful medical care.[citation needed]