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When Are Cancer Screenings Necessary? Cancer screening exams are medical tests done when you're healthy, and you don''t have any signs of illness. They help find cancer at its earliest stage, when the chances for curing the disease are greatest. Exams for colorectal and cervical cancer also find abnormal cells that may turn into cancer. Removing these cells can prevent cancer altogether. M. D. Anderson has specific screening plans for men and women, based on their chances of getting cancer. The exam you get and how often you are tested depends on whether you are at average, increased or high risk for cancer.
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